diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index 9bfc1ee8222d..6d5393204d95 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -390,7 +390,7 @@ bool tomoyo_correct_domain(const unsigned char *domainname)
 		if (!cp)
 			break;
 		if (*domainname != '/' ||
-		    !tomoyo_correct_word2(domainname, cp - domainname - 1))
+		    !tomoyo_correct_word2(domainname, cp - domainname))
 			goto out;
 		domainname = cp + 1;
 	}