diff --git a/src/vim.h b/src/vim.h
index 928a558..96cfc6c 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2439,10 +2439,8 @@
 #define JSON_JS		1   /* use JS instead of JSON */
 #define JSON_NO_NONE	2   /* v:none item not allowed */
 
-#ifdef FEAT_MZSCHEME
-/* this is in main.c, cproto can't handle it. */
-int vim_main2(int argc, char **argv);
-#endif
+/* This is in main.c, cproto can't handle it. */
+int vim_main2(void);
 
 /* Used for flags of do_in_path() */
 #define DIP_ALL	    0x01	/* all matches, not just the first one */