diff --git a/.github/workflows/build_and_deploy_downloader.yml b/.github/workflows/build_and_deploy_downloader.yml
index 36ef0378a..fc95be73c 100644
--- a/.github/workflows/build_and_deploy_downloader.yml
+++ b/.github/workflows/build_and_deploy_downloader.yml
@@ -87,7 +87,7 @@ jobs:
 
       - name: Rename the binary
         run: |
-          case "$OS" in
+          case "$RUNNER_OS" in
             Windows) exe_suffix=.exe;;
             Linux | macOS) exe_suffix=;;
           esac