diff --git a/common/text_window.py b/common/text_window.py
index b815d8022a..1aa3b885ea 100755
--- a/common/text_window.py
+++ b/common/text_window.py
@@ -5,7 +5,7 @@ import subprocess
 from common.basedir import BASEDIR
 
 
-class TextWindow():
+class TextWindow:
   def __init__(self, s, noop=False):
     # text window is only implemented for android currently
     self.text_proc = None
diff --git a/selfdrive/manager.py b/selfdrive/manager.py
index 3c5fcc3667..bcc51ff89f 100755
--- a/selfdrive/manager.py
+++ b/selfdrive/manager.py
@@ -620,8 +620,7 @@ if __name__ == "__main__":
     cloudlog.exception("Manager failed to start")
 
     # Show last 3 lines of traceback
-    error = traceback.format_exc(3)
-
+    error = traceback.format_exc(-3)
     error = "Manager failed to start\n \n" + error
     with TextWindow(error) as t:
       t.wait_for_exit()