diff --git a/processing/post/addCalculation.py b/processing/post/addCalculation.py
index 124949623..8bfc7692f 100755
--- a/processing/post/addCalculation.py
+++ b/processing/post/addCalculation.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2
 # -*- coding: UTF-8 no BOM -*-
 
 import os,re,sys
@@ -180,4 +180,4 @@ for name in filenames:
 
   table.input_close()                                                                                # close ASCII tables
   output.close()                                                                                     # close ASCII tables
-  
\ No newline at end of file
+