diff --git a/Makefile b/Makefile
index 6744b07590..8628ea3537 100644
--- a/Makefile
+++ b/Makefile
@@ -100,10 +100,10 @@ NOSETESTS3 ?= nosetests-3.5
 all: clean python
 
 tests:
-	PYTHONPATH=./lib $(NOSETESTS) -d -w test/units -v --with-coverage --cover-package=ansible --cover-branches
+	PYTHONPATH=./lib $(NOSETESTS) -d -w test/units -v --with-coverage --cover-package=ansible --cover-branches --cover-erase
 
 tests-py3:
-	PYTHONPATH=./lib $(NOSETESTS3) -d -w test/units -v --with-coverage --cover-package=ansible --cover-branches
+	PYTHONPATH=./lib $(NOSETESTS3) -d -w test/units -v --with-coverage --cover-package=ansible --cover-branches --cover-erase
 
 integration:
 	test/utils/shippable/integration.sh