diff --git a/srogue/main.c b/srogue/main.c
index 9b7b647..c7c7606 100644
--- a/srogue/main.c
+++ b/srogue/main.c
@@ -438,7 +438,7 @@ directory_exists(char *dirname)
     struct stat sb;
 
     if (stat(dirname, &sb) == 0) /* path exists */
-        return (S_ISDIR (sb.st_mode));
+        return ((sb.st_mode & S_IFMT) == S_IFDIR);
 
     return(0);
 }