diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index e371f32..3e086f8 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -622,7 +622,7 @@
 extern ctl_table ipv6_route_table[];
 extern ctl_table ipv6_icmp_table[];
 
-extern void ipv6_sysctl_register(void);
+extern int ipv6_sysctl_register(void);
 extern void ipv6_sysctl_unregister(void);
 #endif