diff --git a/apps/openmw/main.cpp b/apps/openmw/main.cpp
index 2bf48c1bb..3129e6bd3 100644
--- a/apps/openmw/main.cpp
+++ b/apps/openmw/main.cpp
@@ -11,6 +11,7 @@
 #include <boost/iostreams/stream_buffer.hpp>
 
 // For OutputDebugString
+#define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 // makes __argc and __argv available on windows
 #include <cstdlib>