diff --git a/.github/workflows/pr-reporter.yml b/.github/workflows/pr-reporter.yml
index ce34bcd4df..75cfdec7c0 100644
--- a/.github/workflows/pr-reporter.yml
+++ b/.github/workflows/pr-reporter.yml
@@ -22,7 +22,7 @@ jobs:
       - uses: dorny/paths-filter@v3
         id: filter
         with:
-          ref: ${{ github.event.workflow_run.head_branch }}
+          ref: ${{ github.event.workflow_run.head_sha }}
           # Should be kept in sync with the filter in the CI workflow
           filters: |
             jsChanged: '**/src/**/*.js'
@@ -72,4 +72,4 @@ jobs:
           path: results/**/*.json
           base-bench-name: preact-main
           pr-bench-name: preact-local
-          summarize: 'duration, usedJSHeapSize'
\ No newline at end of file
+          summarize: 'duration, usedJSHeapSize'