diff --git a/source/wrappers/python/setup.py.in b/source/wrappers/python/setup.py.in
index 3eefcdbe..e78fdf96 100644
--- a/source/wrappers/python/setup.py.in
+++ b/source/wrappers/python/setup.py.in
@@ -82,7 +82,7 @@ ext = Extension(
 def get_version():
     version = '@PROJECT_VERSION@'
     if version.count('.') > 2:
-        version = "Post.".join(s.rsplit('.', 1))
+        version = ".Post".join(version.rsplit('.', 1))
     print("setup version = %s" % version)
     return version