diff --git a/man/man4/zfs.4 b/man/man4/zfs.4
index b01d9a8e5..60ec56b4d 100644
--- a/man/man4/zfs.4
+++ b/man/man4/zfs.4
@@ -273,12 +273,12 @@ force this many of them to be gang blocks.
 .It Sy brt_zap_prefetch Ns = Ns Sy 1 Ns | Ns 0 Pq int
 Controls prefetching BRT records for blocks which are going to be cloned.
 .
-.It Sy brt_zap_default_bs Ns = Ns Sy 12 Po 4 KiB Pc Pq int
+.It Sy brt_zap_default_bs Ns = Ns Sy 13 Po 8 KiB Pc Pq int
 Default BRT ZAP data block size as a power of 2. Note that changing this after
 creating a BRT on the pool will not affect existing BRTs, only newly created
 ones.
 .
-.It Sy brt_zap_default_ibs Ns = Ns Sy 12 Po 4 KiB Pc Pq int
+.It Sy brt_zap_default_ibs Ns = Ns Sy 13 Po 8 KiB Pc Pq int
 Default BRT ZAP indirect block size as a power of 2. Note that changing this
 after creating a BRT on the pool will not affect existing BRTs, only newly
 created ones.
diff --git a/module/zfs/brt.c b/module/zfs/brt.c
index 9e389c872..60f42116c 100644
--- a/module/zfs/brt.c
+++ b/module/zfs/brt.c
@@ -260,8 +260,8 @@ static int brt_zap_prefetch = 1;
 #define	BRT_DEBUG(...)	do { } while (0)
 #endif
 
-static int brt_zap_default_bs = 12;
-static int brt_zap_default_ibs = 12;
+static int brt_zap_default_bs = 13;
+static int brt_zap_default_ibs = 13;
 
 static kstat_t	*brt_ksp;