diff --git a/src/qml/types/qqmlinstantiator_p_p.h b/src/qml/types/qqmlinstantiator_p_p.h
index ac25ce809cd6993114a8681b4122c5549999b45f..a7d6905a7e5584234081c4782de34fd941d3d0a5 100644
--- a/src/qml/types/qqmlinstantiator_p_p.h
+++ b/src/qml/types/qqmlinstantiator_p_p.h
@@ -75,11 +75,11 @@ public:
     void _q_createdItem(int, QObject *);
     void _q_modelUpdated(const QQmlChangeSet &, bool);
 
-    bool componentComplete;
-    bool effectiveReset;
-    bool active;
-    bool async;
-    bool ownModel;
+    bool componentComplete:1;
+    bool effectiveReset:1;
+    bool active:1;
+    bool async:1;
+    bool ownModel:1;
     QVariant model;
     QQmlInstanceModel *instanceModel;
     QQmlComponent *delegate;