diff --git a/Tools/package_release_build.py b/Tools/package_release_build.py
index 1136d9209e..05c39ba08f 100755
--- a/Tools/package_release_build.py
+++ b/Tools/package_release_build.py
@@ -258,7 +258,7 @@ def publish_client_server(runtime: str, target_os: str) -> None:
         "--runtime", runtime,
         "--no-self-contained",
         "-c", "Release",
-        f"/p:TargetOS={str}",
+        f"/p:TargetOS={target_os}",
         "/p:FullRelease=True",
     ]