diff --git a/langfuse/openai.py b/langfuse/openai.py
index 628d17959..5e91edd8e 100644
--- a/langfuse/openai.py
+++ b/langfuse/openai.py
@@ -84,6 +84,7 @@ def _get_call_details(self, result, api_resource_class, **kwargs):
             completion = None
 
         model = kwargs.get("model", None) if isinstance(result, Exception) else result.model
+        user_id = kwargs.get("user_id", None)
 
         usage = None if isinstance(result, Exception) or result.usage is None else LlmUsage(**result.usage)
         endTime = datetime.now()
@@ -112,7 +113,7 @@ def _get_call_details(self, result, api_resource_class, **kwargs):
     def _log_result(self, call_details):
         generation = InitialGeneration(**call_details)
         if call_details["trace_id"] is not None:
-            self.langfuse.trace(CreateTrace(id=call_details["trace_id"]))
+            self.langfuse.trace(CreateTrace(id=call_details["trace_id"], user_id=call_details["user_id"]))
         self.langfuse.generation(generation)
 
     def langfuse_modified(self, func, api_resource_class):
diff --git a/tests/test_openai.py b/tests/test_openai.py
index 1fe20be56..deec60534 100644
--- a/tests/test_openai.py
+++ b/tests/test_openai.py
@@ -18,6 +18,7 @@ def test_openai_chat_completion():
         messages=[{"role": "user", "content": "1 + 1 = "}],
         temperature=0,
         metadata={"someKey": "someResponse"},
+        user_id="someUser"
     )
 
     openai.flush_langfuse()
@@ -32,6 +33,7 @@ def test_openai_chat_completion():
     assert generation.data[0].input == [{"content": "1 + 1 = ", "role": "user"}]
     assert generation.data[0].type == "GENERATION"
     assert generation.data[0].model == "gpt-3.5-turbo-0613"
+    assert generation.data[0].user_id == "someUser"
     assert generation.data[0].start_time is not None
     assert generation.data[0].end_time is not None
     assert generation.data[0].start_time < generation.data[0].end_time