diff --git a/djsupervisor/config.py b/djsupervisor/config.py
index <HASH>..<HASH> 100644
--- a/djsupervisor/config.py
+++ b/djsupervisor/config.py
@@ -274,6 +274,7 @@ def rerender_options(options):
     """
     args = []
     for name,value in options.iteritems():
+        name = name.replace("_","-")
         if value is None:
             pass
         elif isinstance(value,bool):
Fix rerender_options to  turn "project_dir" into "--project-dir"