1 files changed, 6 insertions, 0 deletions
diff --git a/qom/object.c b/qom/object.c
index 7a05e35ed9..760fafb0dc 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -272,6 +272,12 @@ static void type_initialize(TypeImpl *ti)
 
     ti->class_size = type_class_get_size(ti);
     ti->instance_size = type_object_get_size(ti);
+    /* Any type with zero instance_size is implicitly abstract.
+     * This means interface types are all abstract.
+     */
+    if (ti->instance_size == 0) {
+        ti->abstract = true;
+    }
 
     ti->class = g_malloc0(ti->class_size);