diff --git a/.github/workflows/REUSABLE_backend.yml b/.github/workflows/REUSABLE_backend.yml
index a4b8c75bc..84dff2467 100644
--- a/.github/workflows/REUSABLE_backend.yml
+++ b/.github/workflows/REUSABLE_backend.yml
@@ -88,7 +88,9 @@ jobs:
 
     name: 'PHP ${{ matrix.php }} / ${{ matrix.db }} ${{ matrix.prefixStr }}'
 
-    if: inputs.enable_backend_testing
+    if: >-
+      inputs.enable_backend_testing &&
+      ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) || github.event_name != 'pull_request')
 
     steps:
       - uses: actions/checkout@master
diff --git a/.github/workflows/REUSABLE_frontend.yml b/.github/workflows/REUSABLE_frontend.yml
index 81491d138..f68487096 100644
--- a/.github/workflows/REUSABLE_frontend.yml
+++ b/.github/workflows/REUSABLE_frontend.yml
@@ -91,6 +91,9 @@ jobs:
     name: Checks & Build
     runs-on: ubuntu-latest
 
+    if: >-
+      ((github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository) || github.event_name != 'pull_request')
+
     steps:
       - name: Check out code
         uses: actions/checkout@v2