diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index b134f3f..e1d35e1 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -53,7 +53,7 @@
   'discriminator': 'enum1',
   'data': { 'value1' : 'UserDefC', 'value2' : 'UserDefB', 'value3' : 'UserDefA' } }

-{ 'union': 'UserDefAnonUnion',
+{ 'union': 'UserDefAlternate',
   'discriminator': {},
   'data': { 'uda': 'UserDefA', 's': 'str', 'i': 'int' } }

diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 664ae7b..b55ab8d 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -10,7 +10,7 @@
  OrderedDict([('type', 'UserDefUnionBase'), ('data', OrderedDict([('string', 'str'), ('enum1', 'EnumOne')]))]),
  OrderedDict([('union', 'UserDefFlatUnion'), ('base', 'UserDefUnionBase'), ('discriminator', 'enum1'), ('data', OrderedDict([('value1', 'UserDefA'), ('value2', 'UserDefB'), ('value3', 'UserDefB')]))]),
  OrderedDict([('union', 'UserDefFlatUnion2'), ('base', 'UserDefUnionBase'), ('discriminator', 'enum1'), ('data', OrderedDict([('value1', 'UserDefC'), ('value2', 'UserDefB'), ('value3', 'UserDefA')]))]),
- OrderedDict([('union', 'UserDefAnonUnion'), ('discriminator', OrderedDict()), ('data', OrderedDict([('uda', 'UserDefA'), ('s', 'str'), ('i', 'int')]))]),
+ OrderedDict([('union', 'UserDefAlternate'), ('discriminator', OrderedDict()), ('data', OrderedDict([('uda', 'UserDefA'), ('s', 'str'), ('i', 'int')]))]),
  OrderedDict([('union', 'UserDefNativeListUnion'), ('data', OrderedDict([('integer', ['int']), ('s8', ['int8']), ('s16', ['int16']), ('s32', ['int32']), ('s64', ['int64']), ('u8', ['uint8']), ('u16', ['uint16']), ('u32', ['uint32']), ('u64', ['uint64']), ('number', ['number']), ('boolean', ['bool']), ('string', ['str']), ('sizes', ['size'])]))]),
  OrderedDict([('command', 'user_def_cmd'), ('data', OrderedDict())]),
  OrderedDict([('command', 'user_def_cmd1'), ('data', OrderedDict([('ud1a', 'UserDefOne')]))]),
@@ -23,7 +23,7 @@
  OrderedDict([('event', 'EVENT_C'), ('data', OrderedDict([('*a', 'int'), ('*b', 'UserDefOne'), ('c', 'str')]))]),
  OrderedDict([('event', 'EVENT_D'), ('data', OrderedDict([('a', 'EventStructOne'), ('b', 'str'), ('*c', 'str'), ('*enum3', 'EnumOne')]))])]
 [{'enum_name': 'EnumOne', 'enum_values': ['value1', 'value2', 'value3']},
- {'enum_name': 'UserDefAnonUnionKind', 'enum_values': None},
+ {'enum_name': 'UserDefAlternateKind', 'enum_values': None},
  {'enum_name': 'UserDefNativeListUnionKind', 'enum_values': None}]
 [OrderedDict([('type', 'NestedEnumsOne'), ('data', OrderedDict([('enum1', 'EnumOne'), ('*enum2', 'EnumOne'), ('enum3', 'EnumOne'), ('*enum4', 'EnumOne')]))]),
  OrderedDict([('type', 'UserDefZero'), ('data', OrderedDict([('integer', 'int')]))]),
diff --git a/tests/test-qmp-input-strict.c b/tests/test-qmp-input-strict.c
index 53134a1..4b53560 100644
--- a/tests/test-qmp-input-strict.c
+++ b/tests/test-qmp-input-strict.c
@@ -173,18 +173,18 @@ static void test_validate_union_flat(TestInputVisitorData *data,
     qapi_free_UserDefFlatUnion(tmp);
 }

-static void test_validate_union_anon(TestInputVisitorData *data,
-                                     const void *unused)
+static void test_validate_alternate(TestInputVisitorData *data,
+                                    const void *unused)
 {
-    UserDefAnonUnion *tmp = NULL;
+    UserDefAlternate *tmp = NULL;
     Visitor *v;
     Error *err = NULL;

     v = validate_test_init(data, "42");

-    visit_type_UserDefAnonUnion(v, &tmp, NULL, &err);
+    visit_type_UserDefAlternate(v, &tmp, NULL, &err);
     g_assert(!err);
-    qapi_free_UserDefAnonUnion(tmp);
+    qapi_free_UserDefAlternate(tmp);
 }

 static void test_validate_fail_struct(TestInputVisitorData *data,
@@ -276,18 +276,18 @@ static void test_validate_fail_union_flat_no_discrim(TestInputVisitorData *data,
     qapi_free_UserDefFlatUnion2(tmp);
 }

-static void test_validate_fail_union_anon(TestInputVisitorData *data,
-                                          const void *unused)
+static void test_validate_fail_alternate(TestInputVisitorData *data,
+                                         const void *unused)
 {
-    UserDefAnonUnion *tmp = NULL;
+    UserDefAlternate *tmp = NULL;
     Visitor *v;
     Error *err = NULL;

     v = validate_test_init(data, "3.14");

-    visit_type_UserDefAnonUnion(v, &tmp, NULL, &err);
+    visit_type_UserDefAlternate(v, &tmp, NULL, &err);
     g_assert(err);
-    qapi_free_UserDefAnonUnion(tmp);
+    qapi_free_UserDefAlternate(tmp);
 }

 static void validate_test_add(const char *testpath,
@@ -312,8 +312,8 @@ int main(int argc, char **argv)
                       &testdata, test_validate_list);
     validate_test_add("/visitor/input-strict/pass/union-flat",
                       &testdata, test_validate_union_flat);
-    validate_test_add("/visitor/input-strict/pass/union-anon",
-                      &testdata, test_validate_union_anon);
+    validate_test_add("/visitor/input-strict/pass/alternate",
+                      &testdata, test_validate_alternate);
     validate_test_add("/visitor/input-strict/pass/union-native-list",
                       &testdata, test_validate_union_native_list);
     validate_test_add("/visitor/input-strict/fail/struct",
@@ -326,8 +326,8 @@ int main(int argc, char **argv)
                       &testdata, test_validate_fail_union_flat);
     validate_test_add("/visitor/input-strict/fail/union-flat-no-discriminator",
                       &testdata, test_validate_fail_union_flat_no_discrim);
-    validate_test_add("/visitor/input-strict/fail/union-anon",
-                      &testdata, test_validate_fail_union_anon);
+    validate_test_add("/visitor/input-strict/fail/alternate",
+                      &testdata, test_validate_fail_alternate);
     validate_test_add("/visitor/input-strict/fail/union-native-list",
                       &testdata, test_validate_fail_union_native_list);

diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index cc33f64..882359a 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -315,20 +315,20 @@ static void test_visitor_in_union_flat(TestInputVisitorData *data,
     qapi_free_UserDefFlatUnion(tmp);
 }

-static void test_visitor_in_union_anon(TestInputVisitorData *data,
-                                       const void *unused)
+static void test_visitor_in_alternate(TestInputVisitorData *data,
+                                      const void *unused)
 {
     Visitor *v;
     Error *err = NULL;
-    UserDefAnonUnion *tmp;
+    UserDefAlternate *tmp;

     v = visitor_input_test_init(data, "42");

-    visit_type_UserDefAnonUnion(v, &tmp, NULL, &err);
+    visit_type_UserDefAlternate(v, &tmp, NULL, &err);
     g_assert(err == NULL);
-    g_assert_cmpint(tmp->kind, ==, USER_DEF_ANON_UNION_KIND_I);
+    g_assert_cmpint(tmp->kind, ==, USER_DEF_ALTERNATE_KIND_I);
     g_assert_cmpint(tmp->i, ==, 42);
-    qapi_free_UserDefAnonUnion(tmp);
+    qapi_free_UserDefAlternate(tmp);
 }

 static void test_native_list_integer_helper(TestInputVisitorData *data,
@@ -664,8 +664,8 @@ int main(int argc, char **argv)
                            &in_visitor_data, test_visitor_in_list);
     input_visitor_test_add("/visitor/input/union-flat",
                            &in_visitor_data, test_visitor_in_union_flat);
-    input_visitor_test_add("/visitor/input/union-anon",
-                           &in_visitor_data, test_visitor_in_union_anon);
+    input_visitor_test_add("/visitor/input/alternate",
+                           &in_visitor_data, test_visitor_in_alternate);
     input_visitor_test_add("/visitor/input/errors",
                            &in_visitor_data, test_visitor_in_errors);
     input_visitor_test_add("/visitor/input/native_list/int",
diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index ebe6ea3..602bc12 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -453,24 +453,24 @@ static void test_visitor_out_union_flat(TestOutputVisitorData *data,
     QDECREF(qdict);
 }

-static void test_visitor_out_union_anon(TestOutputVisitorData *data,
-                                        const void *unused)
+static void test_visitor_out_alternate(TestOutputVisitorData *data,
+                                       const void *unused)
 {
     QObject *arg;
     Error *err = NULL;

-    UserDefAnonUnion *tmp = g_malloc0(sizeof(UserDefAnonUnion));
-    tmp->kind = USER_DEF_ANON_UNION_KIND_I;
+    UserDefAlternate *tmp = g_malloc0(sizeof(UserDefAlternate));
+    tmp->kind = USER_DEF_ALTERNATE_KIND_I;
     tmp->i = 42;

-    visit_type_UserDefAnonUnion(data->ov, &tmp, NULL, &err);
+    visit_type_UserDefAlternate(data->ov, &tmp, NULL, &err);
     g_assert(err == NULL);
     arg = qmp_output_get_qobject(data->qov);

     g_assert(qobject_type(arg) == QTYPE_QINT);
     g_assert_cmpint(qint_get_int(qobject_to_qint(arg)), ==, 42);

-    qapi_free_UserDefAnonUnion(tmp);
+    qapi_free_UserDefAlternate(tmp);
 }

 static void test_visitor_out_empty(TestOutputVisitorData *data,
@@ -830,8 +830,8 @@ int main(int argc, char **argv)
                             &out_visitor_data, test_visitor_out_list_qapi_free);
     output_visitor_test_add("/visitor/output/union-flat",
                             &out_visitor_data, test_visitor_out_union_flat);
-    output_visitor_test_add("/visitor/output/union-anon",
-                            &out_visitor_data, test_visitor_out_union_anon);
+    output_visitor_test_add("/visitor/output/alternate",
+                            &out_visitor_data, test_visitor_out_alternate);
     output_visitor_test_add("/visitor/output/empty",
                             &out_visitor_data, test_visitor_out_empty);
     output_visitor_test_add("/visitor/output/native_list/int",
