From 0e6ba638124edbf1ca017d5e6082d6738edd2469 Mon Sep 17 00:00:00 2001
From: zhupumpkin <11852827@qq.com>
Date: Fri, 6 Mar 2020 10:31:43 +0800
Subject: [PATCH] fix issue 787

---
 can/message.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/can/message.py b/can/message.py
index f85218fc0..e083859af 100644
--- a/can/message.py
+++ b/can/message.py
@@ -110,7 +110,7 @@ def __init__(self, timestamp=0.0, arbitration_id=0, is_extended_id=None,
         if is_extended_id is not None:
             self.is_extended_id = is_extended_id
         else:
-            self.is_extended_id = True if extended_id is None else extended_id
+            self.is_extended_id = False if extended_id is None else extended_id
 
         self.is_remote_frame = is_remote_frame
         self.is_error_frame = is_error_frame