diff --git a/src/generic/tbarsmpl.cpp b/src/generic/tbarsmpl.cpp
index 522736e77f..b7e16e0d4d 100644
--- a/src/generic/tbarsmpl.cpp
+++ b/src/generic/tbarsmpl.cpp
@@ -356,13 +356,15 @@ bool wxToolBarSimple::Realize()
     }
 
     if ( GetWindowStyleFlag() & wxTB_HORIZONTAL )
-        m_maxWidth += maxToolWidth;
-    else
         m_maxHeight += maxToolHeight;
+    else
+        m_maxWidth += maxToolWidth;
 
     m_maxWidth += m_xMargin;
     m_maxHeight += m_yMargin;
 
+    SetSize(m_maxWidth, m_maxHeight);
+
     return TRUE;
 }