diff --git a/metagpt/provider/openai_api.py b/metagpt/provider/openai_api.py
index 06e06df69..68b0e4171 100644
--- a/metagpt/provider/openai_api.py
+++ b/metagpt/provider/openai_api.py
@@ -276,7 +276,9 @@ class OpenAIGPTAPI(BaseGPTAPI, RateLimiter):
         return response
 
     async def is_related(self, text1, text2):
-        command = f"Paragraph 1:{text1}\n\nParagraph 2:{text2}\n\nIf the two Paragraphs above are related, return [TRUE] brief and clear. Otherwise, return [FALSE]."
+        p1 = text1.replace("\n", " ")
+        p2 = text2.replace("\n", " ")
+        command = f"Paragraph 1:{p1}\n\nParagraph 2:{p2}\n\nIf the two Paragraphs above are related, return [TRUE] brief and clear. Otherwise, return [FALSE]."
         rsp = await self.aask(msg=command, system_msgs=[])
         result, _ = self.extract_info(rsp)
         return result == "TRUE"