diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index d19a84b7950348519741440ed0376579f0e30767..228be551e9c1d896eb97ba00ec78fc80cc47d2c0 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -48,6 +48,7 @@
 #include <linux/pim.h>
 #include <net/addrconf.h>
 #include <linux/netfilter_ipv6.h>
+#include <net/ip6_checksum.h>
 
 /* Big lock, protecting vif table, mrt cache and mroute socket state.
    Note that the changes are semaphored via rtnl_lock.