diff --git a/qutebrowser/app.py b/qutebrowser/app.py
index 81079104a..086c67528 100644
--- a/qutebrowser/app.py
+++ b/qutebrowser/app.py
@@ -792,7 +792,7 @@ class Application(QApplication):
     def exit(self, status):
         """Extend QApplication::exit to log the event."""
         log.destroy.debug("Now calling QApplication::exit.")
-        if self._args.debug_exit:
+        if 'debug_exit' in self._args.debug_flags:
             if hunter is None:
                 print("Not logging late shutdown because hunter could not be "
                       "imported!", file=sys.stderr)
diff --git a/qutebrowser/misc/crashsignal.py b/qutebrowser/misc/crashsignal.py
index aa7438732..d8d8bb385 100644
--- a/qutebrowser/misc/crashsignal.py
+++ b/qutebrowser/misc/crashsignal.py
@@ -207,10 +207,10 @@ class CrashHandler(QObject):
         is_ignored_exception = (exctype is bdb.BdbQuit or
                                 not issubclass(exctype, Exception))
 
-        if self._args.pdb_postmortem:
+        if 'pdb-postmortem' in self._args.debug_flags:
             pdb.post_mortem(tb)
 
-        if is_ignored_exception or self._args.pdb_postmortem:
+        if is_ignored_exception or 'pdb-postmortem' in self._args.debug_flags:
             # pdb exit, KeyboardInterrupt, ...
             status = 0 if is_ignored_exception else 2
             try: