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-rw-r--r--qom/object.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/qom/object.c b/qom/object.c
index 90155faec1..dcb686348b 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -307,6 +307,7 @@ static void type_initialize(TypeImpl *ti)
         int i;
 
         g_assert(parent->class_size <= ti->class_size);
+        g_assert(parent->instance_size <= ti->instance_size);
         memcpy(ti->class, parent->class, parent->class_size);
         ti->class->interfaces = NULL;
         ti->class->properties = g_hash_table_new_full(