diff --git a/cert/vpsRenew b/cert/vpsRenew
index 7e79a45..b2f68a2 100755
--- a/cert/vpsRenew
+++ b/cert/vpsRenew
@@ -2,8 +2,8 @@
 SDIR=$(cd "$(dirname "$0")" ; pwd -P)
 T=$SDIR/../step
 
-FILE=$1
-VALUE=$2
+ACME_FILE=$1
+ACME_VALUE=$2
 
 if [ -z "$FILE" ] || [ -z "$VALUE" ]; then
   echo "Usage: $0 ACME_FILE ACME_VALUE"