diff --git a/run_tests.sh b/run_tests.sh
index c15c227f..58c24ad0 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -2,5 +2,5 @@
 # Simple test runner, should be replaced with tox
 
 rm -rf cover
-nosetests -P -d -v --with-coverage --cover-package=ceilometer --cover-inclusive tests
+nosetests -P -d -v --cover-erase --with-coverage --cover-package=ceilometer --cover-inclusive tests
 tox -e pep8