diff --git a/include/os/freebsd/spl/sys/kmem.h b/include/os/freebsd/spl/sys/kmem.h
index 6155ce6b07..42d162d9a9 100644
--- a/include/os/freebsd/spl/sys/kmem.h
+++ b/include/os/freebsd/spl/sys/kmem.h
@@ -49,7 +49,6 @@ MALLOC_DECLARE(M_SOLARIS);
 #define	KM_NODEBUG		M_NODUMP
 #define	KM_NORMALPRI		0
 #define	KMC_NODEBUG		UMA_ZONE_NODUMP
-#define	KMC_NOTOUCH		0
 
 typedef struct vmem vmem_t;
 
diff --git a/include/os/linux/spl/sys/kmem_cache.h b/include/os/linux/spl/sys/kmem_cache.h
index 754d7f4607..ca1fdeda45 100644
--- a/include/os/linux/spl/sys/kmem_cache.h
+++ b/include/os/linux/spl/sys/kmem_cache.h
@@ -36,7 +36,6 @@
  * destructors which the Linux slab does not.
  */
 typedef enum kmc_bit {
-	KMC_BIT_NOTOUCH		= 0,	/* Don't update ages */
 	KMC_BIT_NODEBUG		= 1,	/* Default behavior */
 	KMC_BIT_NOMAGAZINE	= 2,	/* XXX: Unsupported */
 	KMC_BIT_NOHASH		= 3,	/* XXX: Unsupported */
@@ -63,7 +62,6 @@ typedef enum kmem_cbrc {
 	KMEM_CBRC_DONT_KNOW	= 4,	/* Object unknown */
 } kmem_cbrc_t;
 
-#define	KMC_NOTOUCH		(1 << KMC_BIT_NOTOUCH)
 #define	KMC_NODEBUG		(1 << KMC_BIT_NODEBUG)
 #define	KMC_NOMAGAZINE		(1 << KMC_BIT_NOMAGAZINE)
 #define	KMC_NOHASH		(1 << KMC_BIT_NOHASH)
diff --git a/module/os/freebsd/zfs/abd_os.c b/module/os/freebsd/zfs/abd_os.c
index 6b325affaf..6fb43d6bbf 100644
--- a/module/os/freebsd/zfs/abd_os.c
+++ b/module/os/freebsd/zfs/abd_os.c
@@ -275,7 +275,7 @@ void
 abd_init(void)
 {
 	abd_chunk_cache = kmem_cache_create("abd_chunk", zfs_abd_chunk_size, 0,
-	    NULL, NULL, NULL, NULL, 0, KMC_NOTOUCH | KMC_NODEBUG);
+	    NULL, NULL, NULL, NULL, 0, KMC_NODEBUG);
 
 	abd_ksp = kstat_create("zfs", 0, "abdstats", "misc", KSTAT_TYPE_NAMED,
 	    sizeof (abd_stats) / sizeof (kstat_named_t), KSTAT_FLAG_VIRTUAL);
diff --git a/module/os/linux/spl/spl-kmem-cache.c b/module/os/linux/spl/spl-kmem-cache.c
index 8e5e2942c5..8764c51c7f 100644
--- a/module/os/linux/spl/spl-kmem-cache.c
+++ b/module/os/linux/spl/spl-kmem-cache.c
@@ -720,7 +720,6 @@ spl_magazine_destroy(spl_kmem_cache_t *skc)
  *	KMC_VMEM        Force SPL vmem backed cache
  *	KMC_KVMEM       Force kvmem backed SPL cache
  *	KMC_SLAB        Force Linux slab backed cache
- *	KMC_NOTOUCH	Disable cache object aging (unsupported)
  *	KMC_NODEBUG	Disable debugging (unsupported)
  *	KMC_NOHASH      Disable hashing (unsupported)
  *	KMC_QCACHE	Disable qcache (unsupported)