diff --git a/libgo/misc/cgo/test/callback_c.c b/libgo/misc/cgo/test/callback_c.c
index ee9397cb496..8921b7306c6 100644
--- a/libgo/misc/cgo/test/callback_c.c
+++ b/libgo/misc/cgo/test/callback_c.c
@@ -32,7 +32,6 @@ IntoC(void)
 }
 
 #ifdef WIN32
-#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 long long
 mysleep(int seconds) {