diff --git a/.github/workflows/rhub.yaml b/.github/workflows/rhub.yaml
index b8fdb8bb..561b72ea 100644
--- a/.github/workflows/rhub.yaml
+++ b/.github/workflows/rhub.yaml
@@ -19,6 +19,7 @@ on:
           Multiple entries in new lines or separated by commas.
         required: false
         default: ""
+        type: string
 
 jobs:
   setup: