diff --git a/src/julep/lib/__init__.py b/src/julep/lib/__init__.py
index c328980..43a2873 100644
--- a/src/julep/lib/__init__.py
+++ b/src/julep/lib/__init__.py
@@ -35,11 +35,7 @@ def patched_method(*args: P.args, **kwargs: P.kwargs):
         bound_args.apply_defaults()
 
         # Separate extra keyword arguments
-        extra_kwargs = {}
-        for key in list(bound_args.arguments.keys()):
-            if key not in allowed_kwargs and key not in params:
-                # This key is neither in allowed_kwargs nor a positional argument
-                extra_kwargs[key] = bound_args.arguments.pop(key)
+        extra_kwargs = {k: v for k, v in kwargs.items() if k not in allowed_kwargs and k not in params}
 
         # If there are extra keyword arguments, merge them into 'extra_body'
         if extra_kwargs: