diff --git a/.github/workflows/frontend-tests.yml b/.github/workflows/frontend-tests.yml
index 78cc618f1..f9ea525cb 100644
--- a/.github/workflows/frontend-tests.yml
+++ b/.github/workflows/frontend-tests.yml
@@ -5,6 +5,8 @@ on: [push, pull_request]
 
 jobs:
   withoutplugins:
+    # don't run on PRs from forks
+    if: github.event.pull_request.head.repo.full_name == 'ether/etherpad-lite' || github.event_name == 'push'
     name: Frontend tests without plugins
     runs-on: ubuntu-latest
 
@@ -41,6 +43,8 @@ jobs:
         tests/frontend/travis/runner.sh
 
   withplugins:
+    # don't run on PRs from forks
+    if: github.event.pull_request.head.repo.full_name == 'ether/etherpad-lite' || github.event_name == 'push'
     name: Frontend tests with plugins
     runs-on: ubuntu-latest