diff --git a/libs/partners/xai/langchain_xai/chat_models.py b/libs/partners/xai/langchain_xai/chat_models.py
index 8de52386ab644..4bf9af6cab09b 100644
--- a/libs/partners/xai/langchain_xai/chat_models.py
+++ b/libs/partners/xai/langchain_xai/chat_models.py
@@ -346,7 +346,8 @@ def validate_environment(self) -> Self:
 
         if client_params["api_key"] is None:
             raise ValueError(
-                "xAI API key is not set. Please set it in the `xai_api_key` field or in the `XAI_API_KEY` environment variable."
+                "xAI API key is not set. Please set it in the `xai_api_key` field or "
+                "in the `XAI_API_KEY` environment variable."
             )
 
         if not (self.client or None):