diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 665ef01c..0e2bc3b4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,8 +27,8 @@ jobs:
           os: windows-latest
           id: win
           extra_flags: >
-            -DCMAKE_C_COMPILER=$VCINSTALLDIR\Tools\Llvm\bin\clang-cl.exe
-            -DCMAKE_CXX_COMPILER=$VCINSTALLDIR\Tools\Llvm\bin\clang-cl.exe
+            -DCMAKE_C_COMPILER=%VCINSTALLDIR%\Tools\Llvm\bin\clang-cl.exe
+            -DCMAKE_CXX_COMPILER=%VCINSTALLDIR%\Tools\Llvm\bin\clang-cl.exe
             -G Ninja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DGEODE_DEBUG=On
           cli_cmd: ''
           package_cmd: 'makensis -WX -V3 ./installer/windows/installer.nsi'