diff --git a/src/corelib/kernel/qobjectdefs.h b/src/corelib/kernel/qobjectdefs.h
index 9053e7e7a5..b9a118e731 100644
--- a/src/corelib/kernel/qobjectdefs.h
+++ b/src/corelib/kernel/qobjectdefs.h
@@ -52,7 +52,7 @@ QT_BEGIN_NAMESPACE
 
 
 class QByteArray;
-class QArrayData;
+struct QArrayData;
 typedef QArrayData QByteArrayData;
 
 class QString;