diff --git a/tests/test-qmp-commands.c b/tests/test-qmp-commands.c
index ea700d8..f23d8ea 100644
--- a/tests/test-qmp-commands.c
+++ b/tests/test-qmp-commands.c
@@ -62,8 +62,8 @@ __org_qemu_x_Union1 *qmp___org_qemu_x_command(__org_qemu_x_EnumList *a,
 {
     __org_qemu_x_Union1 *ret = g_new0(__org_qemu_x_Union1, 1);

-    ret->kind = ORG_QEMU_X_UNION1_KIND___ORG_QEMU_X_BRANCH;
-    ret->__org_qemu_x_branch = strdup("blah1");
+    ret->type = ORG_QEMU_X_UNION1_KIND___ORG_QEMU_X_BRANCH;
+    ret->u.__org_qemu_x_branch = strdup("blah1");

     return ret;
 }
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index 514cfd0..617eada 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -359,7 +359,7 @@ static void test_visitor_in_union_flat(TestInputVisitorData *data,
     g_assert_cmpint(tmp->enum1, ==, ENUM_ONE_VALUE1);
     g_assert_cmpstr(tmp->string, ==, "str");
     g_assert_cmpint(tmp->integer, ==, 41);
-    g_assert_cmpint(tmp->value1->boolean, ==, true);
+    g_assert_cmpint(tmp->u.value1->boolean, ==, true);
     qapi_free_UserDefFlatUnion(tmp);
 }

@@ -372,15 +372,15 @@ static void test_visitor_in_alternate(TestInputVisitorData *data,

     v = visitor_input_test_init(data, "42");
     visit_type_UserDefAlternate(v, &tmp, NULL, &error_abort);
-    g_assert_cmpint(tmp->kind, ==, USER_DEF_ALTERNATE_KIND_I);
-    g_assert_cmpint(tmp->i, ==, 42);
+    g_assert_cmpint(tmp->type, ==, USER_DEF_ALTERNATE_KIND_I);
+    g_assert_cmpint(tmp->u.i, ==, 42);
     qapi_free_UserDefAlternate(tmp);
     visitor_input_teardown(data, NULL);

     v = visitor_input_test_init(data, "'string'");
     visit_type_UserDefAlternate(v, &tmp, NULL, &error_abort);
-    g_assert_cmpint(tmp->kind, ==, USER_DEF_ALTERNATE_KIND_S);
-    g_assert_cmpstr(tmp->s, ==, "string");
+    g_assert_cmpint(tmp->type, ==, USER_DEF_ALTERNATE_KIND_S);
+    g_assert_cmpstr(tmp->u.s, ==, "string");
     qapi_free_UserDefAlternate(tmp);
     visitor_input_teardown(data, NULL);

@@ -419,8 +419,8 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,
      * parse the same as ans */
     v = visitor_input_test_init(data, "42");
     visit_type_AltStrNum(v, &asn, NULL, &err);
-    /* FIXME g_assert_cmpint(asn->kind, == ALT_STR_NUM_KIND_N); */
-    /* FIXME g_assert_cmpfloat(asn->n, ==, 42); */
+    /* FIXME g_assert_cmpint(asn->type, == ALT_STR_NUM_KIND_N); */
+    /* FIXME g_assert_cmpfloat(asn->u.n, ==, 42); */
     g_assert(err);
     error_free(err);
     err = NULL;
@@ -429,29 +429,29 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,

     v = visitor_input_test_init(data, "42");
     visit_type_AltNumStr(v, &ans, NULL, &error_abort);
-    g_assert_cmpint(ans->kind, ==, ALT_NUM_STR_KIND_N);
-    g_assert_cmpfloat(ans->n, ==, 42);
+    g_assert_cmpint(ans->type, ==, ALT_NUM_STR_KIND_N);
+    g_assert_cmpfloat(ans->u.n, ==, 42);
     qapi_free_AltNumStr(ans);
     visitor_input_teardown(data, NULL);

     v = visitor_input_test_init(data, "42");
     visit_type_AltStrInt(v, &asi, NULL, &error_abort);
-    g_assert_cmpint(asi->kind, ==, ALT_STR_INT_KIND_I);
-    g_assert_cmpint(asi->i, ==, 42);
+    g_assert_cmpint(asi->type, ==, ALT_STR_INT_KIND_I);
+    g_assert_cmpint(asi->u.i, ==, 42);
     qapi_free_AltStrInt(asi);
     visitor_input_teardown(data, NULL);

     v = visitor_input_test_init(data, "42");
     visit_type_AltIntNum(v, &ain, NULL, &error_abort);
-    g_assert_cmpint(ain->kind, ==, ALT_INT_NUM_KIND_I);
-    g_assert_cmpint(ain->i, ==, 42);
+    g_assert_cmpint(ain->type, ==, ALT_INT_NUM_KIND_I);
+    g_assert_cmpint(ain->u.i, ==, 42);
     qapi_free_AltIntNum(ain);
     visitor_input_teardown(data, NULL);

     v = visitor_input_test_init(data, "42");
     visit_type_AltNumInt(v, &ani, NULL, &error_abort);
-    g_assert_cmpint(ani->kind, ==, ALT_NUM_INT_KIND_I);
-    g_assert_cmpint(ani->i, ==, 42);
+    g_assert_cmpint(ani->type, ==, ALT_NUM_INT_KIND_I);
+    g_assert_cmpint(ani->u.i, ==, 42);
     qapi_free_AltNumInt(ani);
     visitor_input_teardown(data, NULL);

@@ -467,15 +467,15 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,

     v = visitor_input_test_init(data, "42.5");
     visit_type_AltStrNum(v, &asn, NULL, &error_abort);
-    g_assert_cmpint(asn->kind, ==, ALT_STR_NUM_KIND_N);
-    g_assert_cmpfloat(asn->n, ==, 42.5);
+    g_assert_cmpint(asn->type, ==, ALT_STR_NUM_KIND_N);
+    g_assert_cmpfloat(asn->u.n, ==, 42.5);
     qapi_free_AltStrNum(asn);
     visitor_input_teardown(data, NULL);

     v = visitor_input_test_init(data, "42.5");
     visit_type_AltNumStr(v, &ans, NULL, &error_abort);
-    g_assert_cmpint(ans->kind, ==, ALT_NUM_STR_KIND_N);
-    g_assert_cmpfloat(ans->n, ==, 42.5);
+    g_assert_cmpint(ans->type, ==, ALT_NUM_STR_KIND_N);
+    g_assert_cmpfloat(ans->u.n, ==, 42.5);
     qapi_free_AltNumStr(ans);
     visitor_input_teardown(data, NULL);

@@ -489,15 +489,15 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,

     v = visitor_input_test_init(data, "42.5");
     visit_type_AltIntNum(v, &ain, NULL, &error_abort);
-    g_assert_cmpint(ain->kind, ==, ALT_INT_NUM_KIND_N);
-    g_assert_cmpfloat(ain->n, ==, 42.5);
+    g_assert_cmpint(ain->type, ==, ALT_INT_NUM_KIND_N);
+    g_assert_cmpfloat(ain->u.n, ==, 42.5);
     qapi_free_AltIntNum(ain);
     visitor_input_teardown(data, NULL);

     v = visitor_input_test_init(data, "42.5");
     visit_type_AltNumInt(v, &ani, NULL, &error_abort);
-    g_assert_cmpint(ani->kind, ==, ALT_NUM_INT_KIND_N);
-    g_assert_cmpfloat(ani->n, ==, 42.5);
+    g_assert_cmpint(ani->type, ==, ALT_NUM_INT_KIND_N);
+    g_assert_cmpfloat(ani->u.n, ==, 42.5);
     qapi_free_AltNumInt(ani);
     visitor_input_teardown(data, NULL);
 }
@@ -527,68 +527,68 @@ static void test_native_list_integer_helper(TestInputVisitorData *data,
     visit_type_UserDefNativeListUnion(v, &cvalue, NULL, &err);
     g_assert(err == NULL);
     g_assert(cvalue != NULL);
-    g_assert_cmpint(cvalue->kind, ==, kind);
+    g_assert_cmpint(cvalue->type, ==, kind);

     switch (kind) {
     case USER_DEF_NATIVE_LIST_UNION_KIND_INTEGER: {
         intList *elem = NULL;
-        for (i = 0, elem = cvalue->integer; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.integer; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S8: {
         int8List *elem = NULL;
-        for (i = 0, elem = cvalue->s8; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s8; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S16: {
         int16List *elem = NULL;
-        for (i = 0, elem = cvalue->s16; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s16; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S32: {
         int32List *elem = NULL;
-        for (i = 0, elem = cvalue->s32; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s32; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S64: {
         int64List *elem = NULL;
-        for (i = 0, elem = cvalue->s64; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s64; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U8: {
         uint8List *elem = NULL;
-        for (i = 0, elem = cvalue->u8; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u8; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U16: {
         uint16List *elem = NULL;
-        for (i = 0, elem = cvalue->u16; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u16; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U32: {
         uint32List *elem = NULL;
-        for (i = 0, elem = cvalue->u32; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u32; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U64: {
         uint64List *elem = NULL;
-        for (i = 0, elem = cvalue->u64; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u64; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
@@ -690,9 +690,9 @@ static void test_visitor_in_native_list_bool(TestInputVisitorData *data,
     visit_type_UserDefNativeListUnion(v, &cvalue, NULL, &err);
     g_assert(err == NULL);
     g_assert(cvalue != NULL);
-    g_assert_cmpint(cvalue->kind, ==, USER_DEF_NATIVE_LIST_UNION_KIND_BOOLEAN);
+    g_assert_cmpint(cvalue->type, ==, USER_DEF_NATIVE_LIST_UNION_KIND_BOOLEAN);

-    for (i = 0, elem = cvalue->boolean; elem; elem = elem->next, i++) {
+    for (i = 0, elem = cvalue->u.boolean; elem; elem = elem->next, i++) {
         g_assert_cmpint(elem->value, ==, (i % 3 == 0) ? 1 : 0);
     }

@@ -725,9 +725,9 @@ static void test_visitor_in_native_list_string(TestInputVisitorData *data,
     visit_type_UserDefNativeListUnion(v, &cvalue, NULL, &err);
     g_assert(err == NULL);
     g_assert(cvalue != NULL);
-    g_assert_cmpint(cvalue->kind, ==, USER_DEF_NATIVE_LIST_UNION_KIND_STRING);
+    g_assert_cmpint(cvalue->type, ==, USER_DEF_NATIVE_LIST_UNION_KIND_STRING);

-    for (i = 0, elem = cvalue->string; elem; elem = elem->next, i++) {
+    for (i = 0, elem = cvalue->u.string; elem; elem = elem->next, i++) {
         gchar str[8];
         sprintf(str, "%d", i);
         g_assert_cmpstr(elem->value, ==, str);
@@ -764,9 +764,9 @@ static void test_visitor_in_native_list_number(TestInputVisitorData *data,
     visit_type_UserDefNativeListUnion(v, &cvalue, NULL, &err);
     g_assert(err == NULL);
     g_assert(cvalue != NULL);
-    g_assert_cmpint(cvalue->kind, ==, USER_DEF_NATIVE_LIST_UNION_KIND_NUMBER);
+    g_assert_cmpint(cvalue->type, ==, USER_DEF_NATIVE_LIST_UNION_KIND_NUMBER);

-    for (i = 0, elem = cvalue->number; elem; elem = elem->next, i++) {
+    for (i = 0, elem = cvalue->u.number; elem; elem = elem->next, i++) {
         GString *double_expected = g_string_new("");
         GString *double_actual = g_string_new("");

diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index cfb06bb..09d0dd8 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -487,9 +487,9 @@ static void test_visitor_out_union_flat(TestOutputVisitorData *data,
     UserDefFlatUnion *tmp = g_malloc0(sizeof(UserDefFlatUnion));
     tmp->enum1 = ENUM_ONE_VALUE1;
     tmp->string = g_strdup("str");
-    tmp->value1 = g_malloc0(sizeof(UserDefA));
-    /* TODO when generator bug is fixed: tmp->integer = 41; */
-    tmp->value1->boolean = true;
+    tmp->u.value1 = g_malloc0(sizeof(UserDefA));
+    tmp->integer = 41;
+    tmp->u.value1->boolean = true;

     visit_type_UserDefFlatUnion(data->ov, &tmp, NULL, &err);
     g_assert(err == NULL);
@@ -500,7 +500,7 @@ static void test_visitor_out_union_flat(TestOutputVisitorData *data,

     g_assert_cmpstr(qdict_get_str(qdict, "enum1"), ==, "value1");
     g_assert_cmpstr(qdict_get_str(qdict, "string"), ==, "str");
-    /* TODO g_assert_cmpint(qdict_get_int(qdict, "integer"), ==, 41); */
+    g_assert_cmpint(qdict_get_int(qdict, "integer"), ==, 41);
     g_assert_cmpint(qdict_get_bool(qdict, "boolean"), ==, true);

     qapi_free_UserDefFlatUnion(tmp);
@@ -514,8 +514,8 @@ static void test_visitor_out_alternate(TestOutputVisitorData *data,
     Error *err = NULL;

     UserDefAlternate *tmp = g_malloc0(sizeof(UserDefAlternate));
-    tmp->kind = USER_DEF_ALTERNATE_KIND_I;
-    tmp->i = 42;
+    tmp->type = USER_DEF_ALTERNATE_KIND_I;
+    tmp->u.i = 42;

     visit_type_UserDefAlternate(data->ov, &tmp, NULL, &err);
     g_assert(err == NULL);
@@ -540,9 +540,9 @@ static void test_visitor_out_empty(TestOutputVisitorData *data,
 static void init_native_list(UserDefNativeListUnion *cvalue)
 {
     int i;
-    switch (cvalue->kind) {
+    switch (cvalue->type) {
     case USER_DEF_NATIVE_LIST_UNION_KIND_INTEGER: {
-        intList **list = &cvalue->integer;
+        intList **list = &cvalue->u.integer;
         for (i = 0; i < 32; i++) {
             *list = g_new0(intList, 1);
             (*list)->value = i;
@@ -552,7 +552,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S8: {
-        int8List **list = &cvalue->s8;
+        int8List **list = &cvalue->u.s8;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int8List, 1);
             (*list)->value = i;
@@ -562,7 +562,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S16: {
-        int16List **list = &cvalue->s16;
+        int16List **list = &cvalue->u.s16;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int16List, 1);
             (*list)->value = i;
@@ -572,7 +572,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S32: {
-        int32List **list = &cvalue->s32;
+        int32List **list = &cvalue->u.s32;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int32List, 1);
             (*list)->value = i;
@@ -582,7 +582,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S64: {
-        int64List **list = &cvalue->s64;
+        int64List **list = &cvalue->u.s64;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int64List, 1);
             (*list)->value = i;
@@ -592,7 +592,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U8: {
-        uint8List **list = &cvalue->u8;
+        uint8List **list = &cvalue->u.u8;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint8List, 1);
             (*list)->value = i;
@@ -602,7 +602,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U16: {
-        uint16List **list = &cvalue->u16;
+        uint16List **list = &cvalue->u.u16;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint16List, 1);
             (*list)->value = i;
@@ -612,7 +612,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U32: {
-        uint32List **list = &cvalue->u32;
+        uint32List **list = &cvalue->u.u32;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint32List, 1);
             (*list)->value = i;
@@ -622,7 +622,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U64: {
-        uint64List **list = &cvalue->u64;
+        uint64List **list = &cvalue->u.u64;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint64List, 1);
             (*list)->value = i;
@@ -632,7 +632,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_BOOLEAN: {
-        boolList **list = &cvalue->boolean;
+        boolList **list = &cvalue->u.boolean;
         for (i = 0; i < 32; i++) {
             *list = g_new0(boolList, 1);
             (*list)->value = (i % 3 == 0);
@@ -642,7 +642,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_STRING: {
-        strList **list = &cvalue->string;
+        strList **list = &cvalue->u.string;
         for (i = 0; i < 32; i++) {
             *list = g_new0(strList, 1);
             (*list)->value = g_strdup_printf("%d", i);
@@ -652,7 +652,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_NUMBER: {
-        numberList **list = &cvalue->number;
+        numberList **list = &cvalue->u.number;
         for (i = 0; i < 32; i++) {
             *list = g_new0(numberList, 1);
             (*list)->value = (double)i / 3;
@@ -761,14 +761,14 @@ static void test_native_list(TestOutputVisitorData *data,
     Error *err = NULL;
     QObject *obj;

-    cvalue->kind = kind;
+    cvalue->type = kind;
     init_native_list(cvalue);

     visit_type_UserDefNativeListUnion(data->ov, &cvalue, NULL, &err);
     g_assert(err == NULL);

     obj = qmp_output_get_qobject(data->qov);
-    check_native_list(obj, cvalue->kind);
+    check_native_list(obj, cvalue->type);
     qapi_free_UserDefNativeListUnion(cvalue);
     qobject_decref(obj);
 }
