diff --git a/upgrade_roundcube.sh b/upgrade_roundcube.sh
index c85cc3d..62ec90f 100755
--- a/upgrade_roundcube.sh
+++ b/upgrade_roundcube.sh
@@ -323,7 +323,6 @@ if [ "$DB_TYPE" = "postgres" -o  "$DB_TYPE" = "postgresql" -o "$DB_TYPE" = "pgsq
 fi
 
 
-mysql_credential_args="$MYSQL_CREDENTIALS"
 if [[ "$DB_TYPE" = "mysql" ]] ; then
 
    if [[ -z ${MYSQL_CREDENTIALS} ]] ; then