diff --git a/ipc/compat.c b/ipc/compat.c
index a4695ada3275742e0bd5258e55ab046751fb38b4..45d035d4cedcfff58934b3f8e15aac4e6162d5de 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -113,9 +113,6 @@ struct compat_shm_info {
 	compat_ulong_t swap_attempts, swap_successes;
 };
 
-extern int sem_ctls[];
-#define sc_semopm	(sem_ctls[2])
-
 static inline int compat_ipc_parse_version(int *cmd)
 {
 #ifdef	CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION