diff --git a/core/rtw_br_ext.c b/core/rtw_br_ext.c
index c5a7684..bc2365a 100644
--- a/core/rtw_br_ext.c
+++ b/core/rtw_br_ext.c
@@ -47,6 +47,7 @@
 #ifdef __KERNEL__
 #include <linux/ipv6.h>
 #include <linux/icmpv6.h>
+#include <net/ip6_checksum.h>
 #include <net/ndisc.h>
 #include <net/checksum.h>
 #endif