diff --git a/src/lpp.py b/src/lpp.py
old mode 100644
new mode 100755
index bf2c3d7..d021541
--- a/src/lpp.py
+++ b/src/lpp.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 oneline = "writing pp-data in vtk format automatically, saving memory"
 
 docstr = """this is the docstr of LIGGGHTSPostProcessing"""