diff --git a/Makefile b/Makefile
index b6204d6..4553443 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-PYTEST_ARGS := -W ignore::DeprecationWarning -vv
+PYTEST_ARGS := -W ignore::DeprecationWarning -vv -x
 
 all: docs test