diff --git a/instructor/function_calls.py b/instructor/function_calls.py
index c759aae..6146ec1 100644
--- a/instructor/function_calls.py
+++ b/instructor/function_calls.py
@@ -27,16 +27,6 @@ from typing import Any, Callable
 from pydantic import BaseModel, create_model, validate_arguments
 
 
-def _remove_a_key(d, remove_key) -> None:
-    """Remove a key from a dictionary recursively"""
-    if isinstance(d, dict):
-        for key in list(d.keys()):
-            if key == remove_key and "type" in d.keys():
-                del d[key]
-            else:
-                _remove_a_key(d[key], remove_key)
-
-
 class openai_function:
     """
     Decorator to convert a function into an OpenAI function.
@@ -82,8 +72,6 @@ class openai_function:
         parameters["required"] = sorted(
             k for k, v in parameters["properties"].items() if not "default" in v
         )
-        _remove_a_key(parameters, "additionalProperties")
-        _remove_a_key(parameters, "title")
         self.openai_schema = {
             "name": self.func.__name__,
             "description": self.docstring.short_description,