diff --git a/kernel-module/xt_RTPENGINE.c b/kernel-module/xt_RTPENGINE.c
index 64323b8c5..d747d01c0 100644
--- a/kernel-module/xt_RTPENGINE.c
+++ b/kernel-module/xt_RTPENGINE.c
@@ -2,6 +2,7 @@
 #include <linux/module.h>
 #include <linux/skbuff.h>
 #include <linux/ip.h>
+#include <net/ip6_checksum.h>
 #include <linux/udp.h>
 #include <linux/icmp.h>
 #include <linux/version.h>