diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 36e2bb9f..886c7c4c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -42,6 +42,7 @@ jobs:
 
       - name: "Upload coverage to Codecov"
         # if: "contains(env.USING_COVERAGE, matrix.python-version)"
+        if: github.repository == 'python-attrs/cattrs'
         uses: "codecov/codecov-action@v1"
         with:
           fail_ci_if_error: true