diff --git a/mujson_mgr.py b/mujson_mgr.py
index 0d5c13d..092baf8 100644
--- a/mujson_mgr.py
+++ b/mujson_mgr.py
@@ -180,7 +180,7 @@ def main():
 			elif key == '-o':
 				user['obfs'] = value
 			elif key == '-O':
-				user['protocal'] = value
+				user['protocol'] = value
 			elif key == '-m':
 				user['method'] = value
 			elif key == '-f':