diff --git a/.github/workflows/pkgdown.yaml b/.github/workflows/pkgdown.yaml
index 12e352b3..e591f1d9 100644
--- a/.github/workflows/pkgdown.yaml
+++ b/.github/workflows/pkgdown.yaml
@@ -15,6 +15,8 @@ name: pkgdown
 
 jobs:
   pkgdown:
+    # only build docs on the main repository and not forks
+    if: github.repository_owner == 'cmu-delphi'
     runs-on: ubuntu-latest
     # Only restrict concurrency for non-PR jobs
     concurrency: