diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 5815b3057d..f2d7d8849f 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -1429,6 +1429,9 @@ void wxWindowBase::DeleteRelatedConstraints()
 
 void wxWindowBase::SetSizer(wxSizer *sizer, bool deleteOld)
 {
+    if ( sizer == m_windowSizer)
+        return;
+    
     if ( deleteOld )
         delete m_windowSizer;