diff --git a/src/os_w32exe.c b/src/os_w32exe.c
index 8c48fb3..76f9332 100644
--- a/src/os_w32exe.c
+++ b/src/os_w32exe.c
@@ -28,14 +28,14 @@
     main
 #endif
 	__ARGS((int argc, char **argv));
-int (_cdecl *pmain)(int, char **);
+static int (_cdecl *pmain)(int, char **);
 
 #ifndef PROTO
 #ifdef FEAT_GUI
 #ifndef VIMDLL
 void _cdecl SaveInst(HINSTANCE hInst);
 #endif
-void (_cdecl *pSaveInst)(HINSTANCE);
+static void (_cdecl *pSaveInst)(HINSTANCE);
 #endif
 
 /*ARGSUSED*/