diff --git a/lbrynet/daemon/auth/server.py b/lbrynet/daemon/auth/server.py
index 7169f8b87..e88f93af6 100644
--- a/lbrynet/daemon/auth/server.py
+++ b/lbrynet/daemon/auth/server.py
@@ -436,7 +436,7 @@ class AuthJSONRPCServer(AuthorizedBase):
 
         duplicate_params = [
             duplicate_param
-            for duplicate_param in argspec.args[1:len(args_tup) + 2]
+            for duplicate_param in argspec.args[1:len(args_tup) + 1]
             if duplicate_param in args_dict
         ]