diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 106bf9d4b3..144350989f 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -11,6 +11,7 @@ on:
       - published
 jobs:
   ubuntu:
+    if: startsWith(github.repository, 'Homebrew/')
     runs-on: ubuntu-latest
     strategy:
       matrix: