diff --git a/salt-keydiff.sh b/salt-keydiff.sh
index b4de6a9..a6c66e0 100755
--- a/salt-keydiff.sh
+++ b/salt-keydiff.sh
@@ -13,6 +13,7 @@
 set -Ceu
 
 minion="${1:-null}"
+key_user="${2:-null}"
 NOCOLOR="$(tput sgr0)"
 
 if ! command -v jq >/dev/null || ! command -v salt-key >/dev/null
@@ -35,8 +36,11 @@ then
 	exit 2
 fi
 
-printf 'Enter fingerprint to diff against (run `salt-call --local key.finger` on the minion)\n'
-read -r key_user
+if [ "$key_user" = 'null' ]
+then
+	printf 'Enter fingerprint to diff against (run `salt-call --local key.finger` on the minion)\n'
+	read -r key_user
+fi
 
 if [ "$key_salt" = "$key_user" ]
 then