diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 636094c29b167e185168d10882fd2c497903d166..6da6772c19ff77254df762d50058574a663f822f 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -92,19 +92,16 @@ extern struct ipc_namespace init_ipc_ns;
 
 #ifdef CONFIG_SYSVIPC
 #define INIT_IPC_NS(ns)		.ns		= &init_ipc_ns,
+extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
 #else
 #define INIT_IPC_NS(ns)
+static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{ return 0; }
 #endif
 
 #ifdef CONFIG_IPC_NS
 extern void free_ipc_ns(struct kref *kref);
-extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
 extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
-#else
-static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
-{
-	return 0;
-}
 #endif
 
 static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
diff --git a/ipc/util.c b/ipc/util.c
index 08a647965b9e9c360ce0e182b53e294d347d2578..0b652387d169a6b6af1609071bfb3aa2e8a6b954 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -144,6 +144,13 @@ void free_ipc_ns(struct kref *kref)
 	shm_exit_ns(ns);
 	kfree(ns);
 }
+#else
+int copy_ipcs(unsigned long flags, struct task_struct *tsk)
+{
+	if (flags & CLONE_NEWIPC)
+		return -EINVAL;
+	return 0;
+}
 #endif
 
 /**