diff --git a/src/wxWindows.dsp b/src/wxWindows.dsp
index c953c0ef1e..68be2269f9 100644
--- a/src/wxWindows.dsp
+++ b/src/wxWindows.dsp
@@ -2579,10 +2579,6 @@ SOURCE=..\include\wx\msgout.h
 # End Source File
 # Begin Source File
 
-SOURCE=..\include\wx\msgout.h
-# End Source File
-# Begin Source File
-
 SOURCE=..\include\wx\mstream.h
 # End Source File
 # Begin Source File