diff --git a/prompterator/models/openai_models.py b/prompterator/models/openai_models.py
index 1a72656..ac25f67 100644
--- a/prompterator/models/openai_models.py
+++ b/prompterator/models/openai_models.py
@@ -108,7 +108,7 @@ def build_function_calling_tooling(json_schema, function_name):
                 "function": {
                     "name": function_name,
                     "description": description,
-                    "parameters": function,
+                    "parameters": function["parameters"],
                 },
             }
         ]