diff --git a/.github/workflows/step-run-tests-windows.yml b/.github/workflows/step-run-tests-windows.yml
index 3cc6d65e..9c742709 100644
--- a/.github/workflows/step-run-tests-windows.yml
+++ b/.github/workflows/step-run-tests-windows.yml
@@ -90,7 +90,7 @@ jobs:
     - name: set short_locale
       id: short_locale
       run: |
-        Write-Output "substring='${{ inputs.locale }}'.Substring(0, 2)" >> $Env:GITHUB_OUTPUT
+        Write-Output "substring=" + '${{ inputs.locale }}'.Substring(0, 2) >> $Env:GITHUB_OUTPUT
 
     - name: Test
       run: |