diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 47abc446912953686a68afe376fc336e048f69b4..51db4c0f45bb1f7823d96a95e4809cbf892003b4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,7 @@ jobs:
         name: Documentation
         runs-on: ubuntu-latest
         steps:
+        -   uses: actions/checkout@v2
         -   name: "Main Script"
             run: |
                 CONDA_ENVIRONMENT=.test-conda-env-py3.yml