diff --git a/dyndns.sh b/dyndns.sh
index dd0b442..19498ab 100755
--- a/dyndns.sh
+++ b/dyndns.sh
@@ -33,7 +33,7 @@ echo "$HOST_IP" >> $PATH_LOG
 ###############
 # DO THE WORK #
 ###############
-if [ -z $CURRENT_IP -o -z $HOST_IP ]
+if [ -z "$CURRENT_IP" -o -z "$HOST_IP" ]
 then
         echo "No IP retrieved" >> $PATH_LOG
 else