diff --git a/src/declarativeimports/core/dialog.h b/src/declarativeimports/core/dialog.h
index ef15c1169..89ad1cca3 100644
--- a/src/declarativeimports/core/dialog.h
+++ b/src/declarativeimports/core/dialog.h
@@ -202,6 +202,7 @@ Q_SIGNALS:
     void visualParentChanged();
 
 private Q_SLOTS:
+    void syncMainItemToSize();
     void syncToMainItemSize();
 
 protected: