diff --git a/ipc/shm.c b/ipc/shm.c
index 4cd402e4cfeb603e2417a3796c3d9b22f3022f89..1c65fb357395eace45f25a7c6a37d91ebe30a722 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -206,7 +206,7 @@ static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
 	 * Callers of shm_lock() must validate the status of the returned ipc
 	 * object pointer and error out as appropriate.
 	 */
-	return (void *)ipcp;
+	return ERR_CAST(ipcp);
 }
 
 static inline void shm_lock_by_ptr(struct shmid_kernel *ipcp)