diff --git a/.github/workflows/pack.yml b/.github/workflows/pack.yml
index 780e310..72219ce 100644
--- a/.github/workflows/pack.yml
+++ b/.github/workflows/pack.yml
@@ -31,7 +31,8 @@ jobs:
     - name: Determine Pre-release Status
       id: prerelease
       run: |
-        if (${{ github.ref }} -like "*alpha*") {
+        $ref = "${{ github.ref }}"
+        if ($ref -like "*alpha*") {
           echo "##[set-output name=status;]true"
         } else {
           echo "##[set-output name=status;]false"