diff --git a/misopy/index_gff b/misopy/index_gff
index d223281..bcf8cd5 100644
--- a/misopy/index_gff
+++ b/misopy/index_gff
@@ -1,3 +1,4 @@
+#!/usr/bin/env/python -E
 # -*- mode: python; -*-
 ##
 ## Script to build an indexed representation of a GFF file for efficient