diff --git a/tests/check-qom-interface.c b/tests/check-qom-interface.c
index 719ddcf2e0..f87c9aaa8a 100644
--- a/tests/check-qom-interface.c
+++ b/tests/check-qom-interface.c
@@ -76,6 +76,7 @@ static void test_interface_impl(const char *type)
 
     g_assert(iobj);
     g_assert(ioc->test == PATTERN);
+    object_unref(obj);
 }
 
 static void interface_direct_test(void)