diff --git a/roundup/rest.py b/roundup/rest.py
index 11cac767..ad6a014a 100644
--- a/roundup/rest.py
+++ b/roundup/rest.py
@@ -424,7 +424,7 @@ def execute(cls, instance, path, method, input_payload):
 
                 # zip the varlist into a dictionary, and pass it to the caller
                 args = dict(zip(list_vars, match_obj.groups()))
-                args['input'] = input_payload
+                args['input_payload'] = input_payload
                 return func(instance, **args)
         raise NotFound('Nothing matches the given URI')