diff --git a/bindings/python/setup.py b/bindings/python/setup.py
index 78faf436ab6..a30d9eec6b6 100755
--- a/bindings/python/setup.py
+++ b/bindings/python/setup.py
@@ -93,7 +93,10 @@ def write_b2_python_config(target, config):
     # necessary everywhere else, or else b2 will just build "libtorrent.so".
     # python.jam appends SHLIB_SUFFIX on its own.
     target = target.name.split("libtorrent")[1]
-    suffix = sysconfig.get_config_var("SHLIB_SUFFIX")
+    if os.name == "nt":
+        suffix = sysconfig.get_config_var("EXT_SUFFIX")
+    else:
+        suffix = sysconfig.get_config_var("SHLIB_SUFFIX")
     if suffix != None and target.endswith(suffix):
         target = target[:-len(suffix)]