From e8d18c1856179c9354b1974ea39f0f521bc896f3 Mon Sep 17 00:00:00 2001
From: Oleg Hahm <oleg@hobbykeller.org>
Date: Tue, 1 Mar 2016 18:31:55 +0100
Subject: [PATCH] sixlowpan: check the first 2 bits of dispatch byte

---
 sys/include/net/sixlowpan.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/include/net/sixlowpan.h b/sys/include/net/sixlowpan.h
index 583903b2f8..eb9bdac4ea 100644
--- a/sys/include/net/sixlowpan.h
+++ b/sys/include/net/sixlowpan.h
@@ -71,7 +71,7 @@ extern "C" {
  */
 static inline bool sixlowpan_nalp(uint8_t disp)
 {
-    return (disp & 0x3f);
+    return ((disp & 0xc0) == 0);
 }
 /** @} */