diff --git a/.github/workflows/publish-docs.yaml b/.github/workflows/publish-docs.yaml
index 1846841a4f49..0d5180ace57f 100644
--- a/.github/workflows/publish-docs.yaml
+++ b/.github/workflows/publish-docs.yaml
@@ -6,6 +6,7 @@ on:
 
 jobs:
   build:
+    if: github.repository == 'carbon-language/carbon-lang'
     runs-on: [ubuntu-latest]
     steps:
       - uses: actions/checkout@v2