diff --git a/ver.c b/ver.c
index 1225bf6..921005f 100644
--- a/ver.c
+++ b/ver.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010 Junjiro R. Okajima
+ * Copyright (C) 2011 Junjiro R. Okajima
  *
  * This program, aufs is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,15 +17,20 @@
  */
 
 #include <linux/aufs_type.h>
+#include <regex.h>
 #include <stdio.h>
 #include <string.h>
 #include "au_util.h"
 
 int main(int argc, char *argv[])
 {
-	if (!strncmp(AUFS_VERSION, "3.0", 3)
-	    && (sizeof(AUFS_VERSION) - 1 == 3
-		|| AUFS_VERSION[3] == '-'))
+	regex_t preg;
+	const char *pat = "^3\\.[01](-|$)";
+
+	if (regcomp(&preg, pat, REG_EXTENDED | REG_NOSUB))
+		AuFin("regcomp");
+
+	if (!regexec(&preg, AUFS_VERSION, 0, NULL, 0))
 		return 0;
 
 	puts("Wrong version!\n"