diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 294e08c1..205d6e3b 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -35,6 +35,7 @@ on:
 
 jobs:
   build:
+    if: (github.event_name != 'pull_request' && ! github.event.pull_request.head.repo.fork) || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork)
     runs-on: ubuntu-latest
 
     strategy: