diff --git a/ipc/util.h b/ipc/util.h
index 51f7ca58ac67..60ddccca464d 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -153,8 +153,6 @@ extern struct msg_msg *load_msg(const void __user *src, size_t 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, size_t len);
 
-extern void recompute_msgmni(struct ipc_namespace *);
-
 static inline int ipc_buildid(int id, int seq)
 {
 	return SEQ_MULTIPLIER * seq + id;