diff --git a/ocrmypdf/lib/compile_leptonica.py b/ocrmypdf/lib/compile_leptonica.py
index 6273d4bb..062306c3 100644
--- a/ocrmypdf/lib/compile_leptonica.py
+++ b/ocrmypdf/lib/compile_leptonica.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # © 2017 James R. Barlow: github.com/jbarlow83
 
 from cffi import FFI