diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1ac80152..0d02143c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -103,7 +103,7 @@ jobs:
   upload:
     needs: [build, compare]
     runs-on: ubuntu-latest
-    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' && github.repository == 'isledecomp/isle' }}
     steps:
     - uses: actions/checkout@v3
       with: