diff --git a/.github/workflows/test_call.yaml b/.github/workflows/test_call.yaml
index bb897a03..05ec0c60 100644
--- a/.github/workflows/test_call.yaml
+++ b/.github/workflows/test_call.yaml
@@ -17,7 +17,6 @@ on:
         description: Issue number to comment validation summary in.
         required: false
         type: number
-        default: null
 
 concurrency: ${{inputs.environment_name}}-${{inputs.concept_id}}-call