diff --git a/mdadm.h b/mdadm.h
index 25bc623..109f6ef 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -711,7 +711,6 @@ struct supertype {
 	int minor_version;
 	int max_devs;
 	int container_dev;    /* devnum of container */
-	char subarray[32];	/* name of array inside container */
 	void *sb;
 	void *info;
 	int loaded_container;	/* Set if load_super found a container,
diff --git a/mdmon.c b/mdmon.c
index e416b2e..4936260 100644
--- a/mdmon.c
+++ b/mdmon.c
@@ -398,7 +398,6 @@ static int mdmon(char *devname, int devnum, int must_fork, int takeover)
 	container->devnum = devnum;
 	container->devname = devname;
 	container->arrays = NULL;
-	container->subarray[0] = 0;
 	container->sock = -1;
 
 	if (!container->devname) {
diff --git a/super-ddf.c b/super-ddf.c
index 01c376d..51d6929 100644
--- a/super-ddf.c
+++ b/super-ddf.c
@@ -1998,7 +1998,6 @@ static int init_super_ddf_bvd(struct supertype *st,
 	}
 	vcl->lba_offset = (__u64*) &vcl->conf.phys_refnum[ddf->mppe];
 	vcl->vcnum = venum;
-	sprintf(st->subarray, "%d", venum);
 	vcl->block_sizes = NULL; /* FIXME not for CONCAT */
 
 	vc = &vcl->conf;
diff --git a/super-intel.c b/super-intel.c
index 5470c91..3443a2a 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -3075,7 +3075,6 @@ static int init_super_imsm_volume(struct supertype *st, mdu_array_info_t *info,
 
 	if (!check_name(super, name, 0))
 		return 0;
-	sprintf(st->subarray, "%d", idx);
 	dv = malloc(sizeof(*dv));
 	if (!dv) {
 		fprintf(stderr, Name ": failed to allocate device list entry\n");
diff --git a/util.c b/util.c
index 57b7e1f..f3c37e1 100644
--- a/util.c
+++ b/util.c
@@ -1086,7 +1086,6 @@ struct supertype *super_by_fd(int fd, char **subarrayp)
 		sysfs_free(sra);
 	if (st) {
 		st->sb = NULL;
-		st->subarray[0] = 0;
 		*subarrayp = subarray;
 	} else
 		free(subarray);
@@ -1108,7 +1107,6 @@ struct supertype *dup_super(struct supertype *orig)
 	st->ss = orig->ss;
 	st->max_devs = orig->max_devs;
 	st->minor_version = orig->minor_version;
-	strcpy(st->subarray, orig->subarray);
 	st->sb = NULL;
 	st->info = NULL;
 	return st;