diff --git a/Makefile b/Makefile
index d13efa9..fc79d77 100644
--- a/Makefile
+++ b/Makefile
@@ -14,10 +14,10 @@ elea:               \
     long_division.o
 
 hello_world.c: hello_world.elea-txt caratteri.py
-	python caratteri.py $<
+	./caratteri.py $<
 
 long_division.c: long_division.elea-txt caratteri.py
-	python caratteri.py $<
+	./caratteri.py $<
 
 clean: FORCE
 	@rm -f elea *.o tags hello_world.c long_division.c
diff --git a/caratteri.py b/caratteri.py
old mode 100644
new mode 100755
index d572ee6..d4a281d
--- a/caratteri.py
+++ b/caratteri.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # coding=utf8
 
 import sys