diff --git a/pysd/py_backend/xmile/xmile2py.py b/pysd/py_backend/xmile/xmile2py.py
index 7cd5df52..dfb4d58c 100644
--- a/pysd/py_backend/xmile/xmile2py.py
+++ b/pysd/py_backend/xmile/xmile2py.py
@@ -11,6 +11,7 @@
 from lxml import etree
 from ...py_backend import builder, utils
 
+import os.path
 import numpy as np
 
 def translate_xmile(xmile_file):
@@ -327,7 +328,9 @@ def parse_lookup_xml_node(node):
         'arguments': '',
     })
 
-    outfile_name = xmile_file.replace('.xmile', '.py')
+    file_name, file_extension = os.path.splitext(xmile_file)
+
+    outfile_name = file_name + '.py'
 
     builder.build(elements=model_elements,
                   subscript_dict={},