diff --git a/Makefile b/Makefile
index 2d785373eed2201eef48d13c7af55b6f75828051..63659fb76c636d75cc515798129ba916a735d9f5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,51 +1,51 @@
 make: ppparis pref04 pref05 pref06 pref09 pref13 pref31 pref33 pref34 pref35 pref38 pref42 pref44 pref59 pref62 pref65 pref66 pref69 pref80 pref81 pref83 pref87 pref976
 ppparis:
-	python cli.py ppparis
+	bin/python3 cli.py ppparis
 pref04:
-	python cli.py pref04
+	bin/python3 cli.py pref04
 pref05:
-	python cli.py pref05
+	bin/python3 cli.py pref05
 pref06:
-	python cli.py pref06
+	bin/python3 cli.py pref06
 pref09:
-	python cli.py pref09
+	bin/python3 cli.py pref09
 pref13:
-	python cli.py pref13
+	bin/python3 cli.py pref13
 pref31:
-	python cli.py pref31
+	bin/python3 cli.py pref31
 pref33:
-	python cli.py pref33
+	bin/python3 cli.py pref33
 pref34:
-	python cli.py pref34
+	bin/python3 cli.py pref34
 pref35:
-	python cli.py pref35
+	bin/python3 cli.py pref35
 pref38:
-	python cli.py pref38
+	bin/python3 cli.py pref38
 pref42:
-	python cli.py pref42
+	bin/python3 cli.py pref42
 pref44:
-	python cli.py pref44
+	bin/python3 cli.py pref44
 pref59:
-	python cli.py pref59
+	bin/python3 cli.py pref59
 pref62:
-	python cli.py pref62
+	bin/python3 cli.py pref62
 pref64:
-	python cli.py pref64
+	bin/python3 cli.py pref64
 pref65:
-	python cli.py pref65
+	bin/python3 cli.py pref65
 pref66:
-	python cli.py pref66
+	bin/python3 cli.py pref66
 pref69:
-	python cli.py pref69
+	bin/python3 cli.py pref69
 pref80:
-	python cli.py pref80
+	bin/python3 cli.py pref80
 pref81:
-	python cli.py pref81
+	bin/python3 cli.py pref81
 pref83:
-	python cli.py pref83
+	bin/python3 cli.py pref83
 pref87:
-	python cli.py pref87
+	bin/python3 cli.py pref87
 pref976:
-	python cli.py pref976
+	bin/python3 cli.py pref976
 lint:
-	pycodestyle --first --show-source --ignore=E501 *.py
+	bin/pycodestyle --first --show-source --ignore=E501 *.py