diff --git a/tools/pytest.sh b/tools/pytest.sh
index 7c86e6624..250846aec 100755
--- a/tools/pytest.sh
+++ b/tools/pytest.sh
@@ -6,4 +6,4 @@
 # environnment provides two cores. See
 # https://docs.travis-ci.com/user/reference/overview/#Virtualization-environments.
 
-pytest --numprocesses auto --max-slave-restart 5 --boxed -vvvv "$@"
+pytest --full-trace --numprocesses auto --max-slave-restart 5 --boxed -vvvv "$@"