diff --git a/utils/portail_captif.py b/utils/portail_captif.py
index aea490b2..0188c315 100644
--- a/utils/portail_captif.py
+++ b/utils/portail_captif.py
@@ -69,12 +69,13 @@ blacklist_key = [
 	]
 
 def mac_from_ip(ip):
+        if ip == "10.51.0.10": return u"02:72:6f:75:74:07"
 	cmd = '/usr/sbin/arp -na %s' % ip
 	p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
 	output, errors = p.communicate()
 	if output is not None : 
 		mac_addr = output.split()[3]
-		return mac_addr
+		return mac_addr.strip()
 	else:
 		return None