diff --git a/src/osd/sdl/sdlmain.c b/src/osd/sdl/sdlmain.c
index 910b493a536..47d5ba8bcd4 100644
--- a/src/osd/sdl/sdlmain.c
+++ b/src/osd/sdl/sdlmain.c
@@ -2,7 +2,7 @@
 //
 //  sdlmain.c - main file for SDLMAME.
 //
-//  Copyright (c) 1996-2011, Nicola Salmoria and the MAME Team.
+//  Copyright (c) 1996-2012, Nicola Salmoria and the MAME Team.
 //  Visit http://mamedev.org for licensing and usage restrictions.
 //
 //  SDLMAME by Olivier Galibert and R. Belmont
@@ -24,7 +24,7 @@
 #endif
 
 // standard includes
-#ifdef MESS
+#if !defined(SDLMAME_WIN32) && !defined(SDLMAME_OS2)
 #include <unistd.h>
 #endif