diff --git a/qutebrowser/qutebrowser.py b/qutebrowser/qutebrowser.py
index 4a73c1162..cd9ec5938 100644
--- a/qutebrowser/qutebrowser.py
+++ b/qutebrowser/qutebrowser.py
@@ -116,7 +116,7 @@ def get_argparser():
                        nargs=1, action='append')
     debug.add_argument('--debug-flag', type=debug_flag_error, default=[],
                        help="Pass name of debugging feature to be turned on.",
-                       nargs=1, action='append', dest='debug_flags')
+                       action='append', dest='debug_flags')
     parser.add_argument('command', nargs='*', help="Commands to execute on "
                         "startup.", metavar=':command')
     # URLs will actually be in command