diff --git a/.github/workflows/net80-dotnet-format.yml b/.github/workflows/net80-dotnet-format.yml
index 04f5b53..1f6b9c0 100644
--- a/.github/workflows/net80-dotnet-format.yml
+++ b/.github/workflows/net80-dotnet-format.yml
@@ -17,7 +17,7 @@ on:
 
 env:
   DOTNET_FORMAT_VERBOSITY: diag
-  BASE_BRANCH: ${{ context.head_ref }}
+  BASE_BRANCH: ${{ github.head_ref }}
   HEAD_BRANCH: dotnet-format-${{ github.run_id }}
 
 permissions: