diff --git a/ipc/shm.c b/ipc/shm.c
index b27d31f..05c97c7 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -61,8 +61,7 @@
 
 #define shm_unlock(shp)			\
 	ipc_unlock(&(shp)->shm_perm)
-#define shm_buildid(ns, id, seq)	\
-	ipc_buildid(&shm_ids(ns), id, seq)
+#define shm_buildid(id, seq)	ipc_buildid(id, seq)
 
 static int newseg(struct ipc_namespace *, struct ipc_params *);
 static void shm_open(struct vm_area_struct *vma);
@@ -445,7 +444,7 @@
 	shp->shm_ctim = get_seconds();
 	shp->shm_segsz = size;
 	shp->shm_nattch = 0;
-	shp->shm_perm.id = shm_buildid(ns, id, shp->shm_perm.seq);
+	shp->shm_perm.id = shm_buildid(id, shp->shm_perm.seq);
 	shp->shm_file = file;
 	/*
 	 * shmid gets reported as "inode#" in /proc/pid/maps.