diff --git a/.github/workflows/tester.yml b/.github/workflows/tester.yml
index 7ea8b77..708884d 100644
--- a/.github/workflows/tester.yml
+++ b/.github/workflows/tester.yml
@@ -27,9 +27,11 @@ jobs:
       - name: Determine zstd binary version
         shell: bash
         run: |
-          echo "$RUNNER_OS"
+          if [ "$RUNNER_OS" = "Windows" ]; then
+            echo "PLATFORM=win32-x64-msvc" >> "$GITHUB_ENV"
+          fi
       - name: Install zstd binary
-        run: npm install "@mongodb-js/zstd-win32-x64-msvc"
+        run: npm install "@mongodb-js/zstd-$PLATFORM"
       - name: Test
         run: npm run test
         env: