diff --git a/.github/workflows/test_and_deploy.yml b/.github/workflows/test_and_deploy.yml
index b359e6d..e62f67d 100644
--- a/.github/workflows/test_and_deploy.yml
+++ b/.github/workflows/test_and_deploy.yml
@@ -78,7 +78,7 @@ jobs:
         with:
           path: "$HOME/.brainglobe"
           # hash on conftest in case url changes
-          key: brainglobe-dir${{ runner.os }}${{ hashFiles('**/conftest.py') }}
+          key: brainglobe-dir-${{ runner.os }}${{ hashFiles('**/conftest.py') }}
 
       - name: Set up Python
         uses: actions/setup-python@v4