diff --git a/hostapd/ctrl_iface.c b/hostapd/ctrl_iface.c
index e539a0902..75f12e543 100644
--- a/hostapd/ctrl_iface.c
+++ b/hostapd/ctrl_iface.c
@@ -2134,7 +2134,7 @@ static int hostapd_ctrl_set_key(struct hostapd_data *hapd, const char *cmd)
 	if (!pos)
 		return -1;
 	pos++;
-	if (hexstr2bin(pos, seq, sizeof(6)) < 0)
+	if (hexstr2bin(pos, seq, sizeof(seq)) < 0)
 		return -1;
 	pos += 2 * 6;
 	if (*pos != ' ')