diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 182bf92..9b9d0e7 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -66,12 +66,12 @@ jobs:
         # Note the current convention is to use the -S and -B options here to specify source
         # and build directories, but this is only available with CMake 3.13 and higher.
         # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
-        run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE "-DJUPITER_VERSION_SHORT=Win.SHA-$(git rev-parse --short $GITHUB_SHA)"
+        run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$env:BUILD_TYPE "-DJUPITER_VERSION_SHORT=Win.SHA-$(git rev-parse --short $env:GITHUB_SHA)"
 
       - name: Build
         working-directory: ${{github.workspace}}/build
         # Execute the build.  You can specify a specific target with "--target <NAME>"
-        run: cmake --build . --config $BUILD_TYPE --target=PackagedBuild
+        run: cmake --build . --config $env:BUILD_TYPE --target=PackagedBuild
 
       - name: Archive build package / binaries
         uses: actions/upload-artifact@v2