diff --git a/include/qapi/qmp/qerror.h b/include/qapi/qmp/qerror.h
index 6c0a18d..940ac21 100644
--- a/include/qapi/qmp/qerror.h
+++ b/include/qapi/qmp/qerror.h
@@ -69,6 +69,9 @@ void assert_no_error(Error *err);
 #define QERR_BUS_NOT_FOUND \
     ERROR_CLASS_GENERIC_ERROR, "Bus '%s' not found"
 
+#define QERR_BUS_WITH_SLOTS_NOT_FOUND \
+    ERROR_CLASS_GENERIC_ERROR, "No bus called '%s' with free slots was found"
+
 #define QERR_COMMAND_DISABLED \
     ERROR_CLASS_GENERIC_ERROR, "The command %s has been disabled for this instance"
 
diff --git a/hw/qdev-monitor.c b/hw/qdev-monitor.c
index 34f5014..f18fe50 100644
--- a/hw/qdev-monitor.c
+++ b/hw/qdev-monitor.c
@@ -331,7 +331,7 @@ static BusState *qbus_find(const char *path)
         }
         bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
         if (!bus) {
-            qerror_report(QERR_BUS_NOT_FOUND, elem);
+            qerror_report(QERR_BUS_WITH_SLOTS_NOT_FOUND, elem);
             return NULL;
         }
         pos = len;