diff --git a/Makefile b/Makefile
index 9fc021d8021..35e50915199 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@ install:
 	install -m 644 kiwi.yml ${buildroot}etc/kiwi.yml
 
 tox:
-	tox "-n 5"
+	tox -- "-n 5"
 
 kiwi/schema/kiwi.rng: kiwi/schema/kiwi.rnc
 	# whenever the schema is changed this target will convert