diff --git a/.github/workflows/pull-request-tags-suggestions.yml b/.github/workflows/pull-request-tags-suggestions.yml
index deb8e87af..318f5a63b 100644
--- a/.github/workflows/pull-request-tags-suggestions.yml
+++ b/.github/workflows/pull-request-tags-suggestions.yml
@@ -33,5 +33,5 @@ jobs:
         env:
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
           PULL_REQUEST_NUMBER: ${{ github.event.number }}
-          COMMIT_SHA: $GITHUB_SHA
+          COMMIT_SHA: ${{ github.event.pull_request.head.sha }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}