diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 29858ba..9aa92f3 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -46,7 +46,7 @@ jobs:
         path: |
           ${{runner.workspace}}/build/vcpkg_installed
           ${{runner.workspace}}/build/_deps
-        key: ${{ runner.os }}-${{ matrix.cmake-build-type }}-${{ hashFiles('vcpkg.json') }}
+        key: ${{ matrix.configurations.os }}-${{ matrix.cmake-build-type }}-${{ hashFiles('vcpkg.json') }}
 
     - name: Fix Path on Ubuntu
       if: matrix.configurations.os == 'ubuntu-20.04' || matrix.configurations.os == 'ubuntu-18.04'