diff --git a/src/common/sizer.cpp b/src/common/sizer.cpp
index ed956e4aea..e1fbee369a 100644
--- a/src/common/sizer.cpp
+++ b/src/common/sizer.cpp
@@ -878,8 +878,8 @@ bool wxSizer::Replace( size_t old, wxSizerItem *newitem )
     wxSizerItem *item = node->GetData();
     node->SetData(newitem);
 
-    if (item->IsWindow() && item->GetWindow())
-        item->GetWindow()->SetContainingSizer(NULL);
+    if (wxWindow* const w = item->GetWindow())
+        w->SetContainingSizer(NULL);
 
     delete item;