diff --git a/jedi/__main__.py b/jedi/__main__.py
index 9be61837..94a39464 100644
--- a/jedi/__main__.py
+++ b/jedi/__main__.py
@@ -33,3 +33,5 @@ elif len(argv) > 1 and argv[1] == 'force':
         if '--pdb' in sys.argv:
             import pdb
             pdb.post_mortem()
+        else:
+            raise