diff --git a/.github/workflows/sphinx.yml b/.github/workflows/sphinx.yml
index ec1d5a61..4b7c3234 100644
--- a/.github/workflows/sphinx.yml
+++ b/.github/workflows/sphinx.yml
@@ -25,6 +25,7 @@ on:
 jobs:
   build-docs:
     name: Build Sphinx Documentation
+    if: github.repository == 'jupyter/docker-stacks' || github.event_name != 'schedule'
     runs-on: ubuntu-latest
     permissions:
       contents: write