diff --git a/.github/workflows/check-clang-windows.yml b/.github/workflows/check-clang-windows.yml
index aef67e7..ee7e298 100644
--- a/.github/workflows/check-clang-windows.yml
+++ b/.github/workflows/check-clang-windows.yml
@@ -36,9 +36,9 @@ on:
         options: ['No','Yes']
 
 env:
-  builddir: "${{github.workspace}}\b\build"
+  builddir: "${{github.workspace}}\\b\\build"
   BUILDCONFIGURATION: "Release"
-  BUILD_BINARIESDIRECTORY: "${{github.workspace}}\b"
+  BUILD_BINARIESDIRECTORY: "${{github.workspace}}\\b"
   BUILD_SOURCESDIRECTORY: "${{github.workspace}}"
   TEST_TARGET_ARCH:  ${{ github.event.inputs.Architecture}}
   RUN_LOCAL:  "no"