diff --git a/update-config-map.sh b/update-config-map.sh
index acd4be5..f292128 100755
--- a/update-config-map.sh
+++ b/update-config-map.sh
@@ -11,7 +11,7 @@ then
 	exit 1
 fi
 
-if [ -z "$MONGO_HOST" ];
+if [[ -z "$MONGO_HOST" ]];
 then
   MONGO_HOST='mongodb'
 fi