diff --git a/proxy-ssh b/proxy-ssh
index 4ff740a..764a167 100755
--- a/proxy-ssh
+++ b/proxy-ssh
@@ -46,6 +46,13 @@ ensure_ticket()
       expiretm=$(/bin/date -j -f "%b %d %H:%M:%S" +%s "$expires" 2>/dev/null)
       ;;
 
+    Darwin:12.* )
+      # Valid Starting           Expires                 Service Principal
+      # Oct 27 08:50:04 2013     Oct 28 08:50:04 2013    krbtgt/CERN.CH@CERN.CH
+      expires=$(klist 2>/dev/null | grep krbtgt | grep -vi expired | awk '{print $5, $6, $7, $8}')
+      expiretm=$(/bin/date -j -f "%b %d %H:%M:%S %Y" +%s "$expires" 2>/dev/null)
+      ;;
+
     * )
       # Valid starting     Expires            Service principal
       # 10/27/11 09:21:32  10/28/11 08:50:04  krbtgt/CERN.CH@CERN.CH