diff --git a/tui/__init__.py b/tui/__init__.py
index 81a5fdf..1e7b1fe 100644
--- a/tui/__init__.py
+++ b/tui/__init__.py
@@ -668,7 +668,8 @@ def parse(self, argv, usedname, location):
         """
         try:
             value = self.format.parse(argv)
-        except formats.BadNumberOfArguments, e:
+        except (formats.BadNumberOfArgumentsError,) as e:
+             pass
             raise BadNumberOfArguments(usedname, e.required, e.supplied)
         except formats.BadArgument, e:
             raise BadArgument(usedname, e.argument, e.message)
@@ -1601,4 +1602,4 @@ def launch(self,
     def graceful_exit(self, error_message, width=0):
         print >> sys.stderr, self.shorthelp(width)
         sys.exit("ERROR: %s" % error_message)
-        
\ No newline at end of file
+