diff --git a/scripts/issue-auth-cred.sh b/scripts/issue-auth-cred.sh
index 1e22321..785507e 100755
--- a/scripts/issue-auth-cred.sh
+++ b/scripts/issue-auth-cred.sh
@@ -10,4 +10,4 @@ fi
 BASEDIR=$(dirname "$0")
 
 # Sign the auth credential
-axoned --keyring-backend test --keyring-dir "${BASEDIR}"/../example credential sign --from exec-svc "${BASEDIR}/../example/vc-exec-auth.jsonld"
+axoned --keyring-backend test --keyring-dir "${BASEDIR}"/../example credential sign --from exec-svc --purpose authentication "${BASEDIR}/../example/vc-exec-auth.jsonld"