diff --git a/Makefile b/Makefile
index 0ebe7ee..b501f05 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,7 @@ test: ## run tests quickly with the default Python
 	pytest tests -x --disable-warnings --random-order --failed-first
 
 coverage: ## full test suite, check code coverage and open coverage report
-	pytest tests --random-order --cov=sensospot_data
+	pytest tests --random-order --random-order-bucket=global --cov=sensospot_data
 	coverage html
 	$(BROWSER) htmlcov/index.html