diff --git a/debian/rules b/debian/rules
index 8657f86..d7b36a9 100755
--- a/debian/rules
+++ b/debian/rules
@@ -19,3 +19,6 @@
 # Fix favor ISO 639-1 when differing from ISO 639-2
 	mv debian/$(PKG)/usr/share/locale/aym \
 		debian/$(PKG)/usr/share/locale/ay
+# Ensure proper hash-bang in Python script (Python Policy 0.9 §3.1)
+	perl -pi -e 's,^#! ?(/usr/bin/)?(env )?python[[:print:]]*$$,#!/usr/bin/python3,' \
+		debian/*/usr/share/sugar/activities/*/*.py