diff --git a/makefile b/makefile
index 024d988..3276190 100644
--- a/makefile
+++ b/makefile
@@ -13,5 +13,5 @@ test:
 	python3 -munittest
 
 coverage:
-	coverage run --source=jsonpointer tests.py
+	coverage run --source=jsonpointer -m unittest
 	coverage report -m