diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 747ab3b..ef5814d 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -45,7 +45,7 @@ jobs:
         uses: actions/checkout@v2
       - name: Clear toolcache
         shell: pwsh
-        run: __tests__/clear-toolcache.ps1 runner.os
+        run: __tests__/clear-toolcache.ps1 ${{ runner.os }}
 
       - name: Clear tool cache (macOS)
         if: runner.os == 'macos'