diff --git a/pydantic_ai_slim/pydantic_ai/profiles/openai.py b/pydantic_ai_slim/pydantic_ai/profiles/openai.py
index 4367216ad..6db5358d7 100644
--- a/pydantic_ai_slim/pydantic_ai/profiles/openai.py
+++ b/pydantic_ai_slim/pydantic_ai/profiles/openai.py
@@ -114,11 +114,7 @@ def transform(self, schema: JsonSchema) -> JsonSchema:  # noqa C901
                 schema['anyOf'] = [{'$ref': schema.pop('$ref')}]
 
         # Track strict-incompatible keys
-        incompatible_values: dict[str, Any] = {}
-        for key in _STRICT_INCOMPATIBLE_KEYS:
-            value = schema.get(key, _sentinel)
-            if value is not _sentinel:
-                incompatible_values[key] = value
+        incompatible_values = {k: schema[k] for k in _STRICT_INCOMPATIBLE_KEYS if k in schema}
         description = schema.get('description')
         if incompatible_values:
             if self.strict is True: