diff --git a/src/riotwatcher/_apis/helpers.py b/src/riotwatcher/_apis/helpers.py
index 274a99b..15aa3a4 100644
--- a/src/riotwatcher/_apis/helpers.py
+++ b/src/riotwatcher/_apis/helpers.py
@@ -30,10 +30,10 @@ def remapper(*args, **kwargs):
                 if lower_region in remap:
                     kwargs[argument_name] = remap[lower_region]
             if len(args) > argument_pos and isinstance(args[argument_pos], str):
-                region = args[1].lower()
+                region = args[argument_pos].lower()
                 if region in remap:
                     nargs = list(args)
-                    nargs[1] = remap[region]
+                    nargs[argument_pos] = remap[region]
             return api_call(*nargs, **kwargs)
 
         return remapper