diff --git a/src/layouts/qquickgridlayoutengine.cpp b/src/layouts/qquickgridlayoutengine.cpp
index 3906dfbb59f3717f9232c55b5131c037b5b7557b..7935d79c453e99c4ac4f10a91b988f06954530c8 100644
--- a/src/layouts/qquickgridlayoutengine.cpp
+++ b/src/layouts/qquickgridlayoutengine.cpp
@@ -43,6 +43,7 @@
 #include "qquickgridlayoutengine_p.h"
 #include "qquicklayout_p.h"
 
+QT_BEGIN_NAMESPACE
 
 /*
   The layout engine assumes:
@@ -242,3 +243,4 @@ QLayoutPolicy::Policy QQuickGridLayoutItem::effectiveSizePolicy_helper(QQuickIte
     return fillExtent ? QLayoutPolicy::Preferred : QLayoutPolicy::Fixed;
 
 }
+QT_END_NAMESPACE