diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 65cef430..011be87a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -61,7 +61,7 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ${{ matrix.prefix }}
-          key: conda-${{ matrix.label }}-${{ hashFiles(format('conda-{0}.lock'), matrix.label) }}-${{ env.CACHE_NUMBER }}
+          key: conda-${{ matrix.label }}-${{ hashFiles(format('conda-{0}.lock', matrix.label)) }}-${{ env.CACHE_NUMBER }}
         id: cache-conda
 
       - name: Update Conda Environment