diff --git a/.github/workflows/php-compatibility.yml b/.github/workflows/php-compatibility.yml
index 6a6a5b4bd6..e8e8325984 100644
--- a/.github/workflows/php-compatibility.yml
+++ b/.github/workflows/php-compatibility.yml
@@ -1,6 +1,6 @@
 name: 'PHP Compatibility'
 on:
-  workflow_dispatch: true
+  workflow_dispatch:
   pull_request:
     paths:
       - 'classes/**.php'
@@ -17,8 +17,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
       - name: Get Composer Cache Directory
         id: composer-cache
         run: |