diff --git a/.github/workflows/downstream_protobuf_compatibility_check_nightly.yaml b/.github/workflows/downstream_protobuf_compatibility_check_nightly.yaml
index 6b381bd6f5..99c00e72ba 100644
--- a/.github/workflows/downstream_protobuf_compatibility_check_nightly.yaml
+++ b/.github/workflows/downstream_protobuf_compatibility_check_nightly.yaml
@@ -1,5 +1,4 @@
 on:
-  pull_request:
   workflow_dispatch:
     inputs:
       protobuf_versions: