diff --git a/src/mkvdate.c b/src/mkvdate.c
index b560626..7bded6e 100644
--- a/src/mkvdate.c
+++ b/src/mkvdate.c
@@ -61,4 +61,4 @@ int main(void) {
   return (0);
 }
 
-#endif /* SYSVONLY */
+#endif /* DOS */