diff --git a/.github/workflows/msbuild.yml b/.github/workflows/msbuild.yml
index c647286..44d4e55 100644
--- a/.github/workflows/msbuild.yml
+++ b/.github/workflows/msbuild.yml
@@ -64,7 +64,7 @@ jobs:
       with:
         path: |
           $env:MSFS_SDK
-        key: msfs-sdk-$env:MSFS_SDK_VERSION
+        key: msfs-sdk-${{ env.MSFS_SDK_VERSION }}
 
     - if: ${{ steps.cache-msfs-sdk.outputs.cache-hit != 'true' }}
       name: Download MSFS SDK file