diff --git a/logfire/_internal/integrations/openai.py b/logfire/_internal/integrations/openai.py
index 51736e922..23e56dd21 100644
--- a/logfire/_internal/integrations/openai.py
+++ b/logfire/_internal/integrations/openai.py
@@ -275,7 +275,7 @@ def record_chunk(chunk: Any) -> Any:
         if chunk_content is not None:
             content.append(chunk_content)
 
-    timer = logfire_openai._config.ns_timestamp_generator
+    timer = logfire_openai._config.ns_timestamp_generator  # type: ignore
     start = timer()
     try:
         yield record_chunk