diff --git a/ipc/util.h b/ipc/util.h
index a61e0ca..eeb79a1 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -140,6 +140,7 @@
 
 extern void free_msg(struct msg_msg *msg);
 extern struct msg_msg *load_msg(const void __user *src, int len);
+extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst);
 extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
 
 extern void recompute_msgmni(struct ipc_namespace *);