diff --git a/include/wx/prntbase.h b/include/wx/prntbase.h
index d0c05b903b..b8b56e0c2c 100644
--- a/include/wx/prntbase.h
+++ b/include/wx/prntbase.h
@@ -164,8 +164,8 @@ public:
 
     virtual bool TransferTo( wxPrintData &data ) = 0;
     virtual bool TransferFrom( const wxPrintData &data ) = 0;
-#if __WXOSX__
-    // in order to expose functionality already to the result type of the ..PrintData->GetNativeData() 
+#ifdef __WXOSX__
+    // in order to expose functionality already to the result type of the ..PrintData->GetNativeData()
     virtual void TransferFrom( const wxPageSetupDialogData * ) = 0;
     virtual void TransferTo( wxPageSetupDialogData * ) = 0;
 #endif