diff --git a/pytest.ini b/pytest.ini
index 7197b078c6..237066b1f6 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -11,7 +11,7 @@ markers =
 testpaths =
     test_runner
 minversion = 6.0
-log_format = %(asctime)s.%(msecs)-3d %(levelname)s [%(filename)s:%(lineno)d] %(message)s
+log_format = %(asctime)s.%(msecs)03d %(levelname)s [%(filename)s:%(lineno)d] %(message)s
 log_date_format = %Y-%m-%d %H:%M:%S
 log_cli = true
 timeout = 300