diff --git a/src/c_client.py b/src/c_client.py
index 3cef473..3e8c295 100755
--- a/src/c_client.py
+++ b/src/c_client.py
@@ -1,5 +1,4 @@
-#!/usr/bin/env python
-from __future__ import print_function
+#!/usr/bin/env python3
 import getopt
 import os
 import sys
@@ -67,7 +66,7 @@ def _c_wr_stringlist(indent, strlist):
         _c("%s%s", indent, str)
 
 
-class PreCode(object):
+class PreCode:
     '''
     For pre-code generated by expression generation
     (for example, the for-loop of a sumof)