diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 3c79cba5fa4a..ab167037b2dd 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -881,7 +881,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 	if (format == SMK_FIXED24_FMT)
 		rule += SMK_LABELLEN;
 	else
-		rule += strlen(skp->smk_known);
+		rule += strlen(skp->smk_known) + 1;
 
 	ret = sscanf(rule, "%d", &maplevel);
 	if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)