diff --git a/setup.py b/setup.py
index 48272c6..f1830a3 100644
--- a/setup.py
+++ b/setup.py
@@ -134,7 +134,7 @@ def assemble_driver_uri(
             platform = "{}64".format(s_platform)
         else:
             platform = "{}64".format(s_platform)
-    if "win" in platform:
+    if "win" in PLATFORM_MAP[platform]:
         ext = "zip"
     else:
         ext = "tar.gz"