diff --git a/moto/sqs/responses.py b/moto/sqs/responses.py
index 82d24cb6..d1ba5b6d 100644
--- a/moto/sqs/responses.py
+++ b/moto/sqs/responses.py
@@ -108,7 +108,7 @@ class SQSResponse(BaseResponse):
         delay_seconds = self.querystring.get('DelaySeconds')
 
         if len(message) > MAXIMUM_MESSAGE_LENGTH:
-            return "One or more parameters are invalid. Reason: Message must be shorter than 262144 bytes.", dict(status=400)
+            return ERROR_TOO_LONG_RESPONSE, dict(status=400)
 
         if delay_seconds:
             delay_seconds = int(delay_seconds[0])
@@ -421,3 +421,13 @@ PURGE_QUEUE_RESPONSE = """<PurgeQueueResponse>
         </RequestId>
     </ResponseMetadata>
 </PurgeQueueResponse>"""
+
+ERROR_TOO_LONG_RESPONSE = """<ErrorResponse xmlns="http://queue.amazonaws.com/doc/2012-11-05/">
+    <Error>
+        <Type>Sender</Type>
+        <Code>InvalidParameterValue</Code>
+        <Message>One or more parameters are invalid. Reason: Message must be shorter than 262144 bytes.</Message>
+        <Detail/>
+    </Error>
+    <RequestId>6fde8d1e-52cd-4581-8cd9-c512f4c64223</RequestId>
+</ErrorResponse>"""