diff --git a/minio/mc-cp/action.yaml b/minio/mc-cp/action.yaml
index a428db5..9d2cebf 100644
--- a/minio/mc-cp/action.yaml
+++ b/minio/mc-cp/action.yaml
@@ -16,6 +16,7 @@ inputs:
   alias:
     description: "S3 alias."
     required: true
+    default: s3
   url:
     description: "S3 url."
     required: true