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diff --git a/usr.sbin/makefs/makefs.8 b/usr.sbin/makefs/makefs.8
index c46f283f90a8..d20f69d87559 100644
--- a/usr.sbin/makefs/makefs.8
+++ b/usr.sbin/makefs/makefs.8
@@ -550,6 +550,12 @@ This option allows the default heuristic to be overridden.
.It verify-txgs
Prompt OpenZFS to verify pool metadata during import.
This is disabled by default as it may significantly increase import times.
+.It poolguid
+Use the specified 64-bit integer as the pool GUID.
+If this option is not specified, the pool GUID will be random but fixed
+across multiple identical invocations of
+.Nm .
+This option is useful for testing but not required for reproducibility.
.It poolname
The name of the ZFS pool.
This option must be specified.
diff --git a/usr.sbin/makefs/zfs.c b/usr.sbin/makefs/zfs.c
index 66e7f8dafc9c..8d50c450541b 100644
--- a/usr.sbin/makefs/zfs.c
+++ b/usr.sbin/makefs/zfs.c
@@ -38,6 +38,7 @@
#include <stdalign.h>
#include <stdbool.h>
#include <stddef.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@@ -85,6 +86,8 @@ zfs_prep_opts(fsinfo_t *fsopts)
0, 0, "Bootable dataset" },
{ '\0', "mssize", &zfs->mssize, OPT_INT64,
MINMSSIZE, MAXMSSIZE, "Metaslab size" },
+ { '\0', "poolguid", &zfs->poolguid, OPT_INT64,
+ 0, INT64_MAX, "ZFS pool GUID" },
{ '\0', "poolname", &zfs->poolname, OPT_STRPTR,
0, 0, "ZFS pool name" },
{ '\0', "rootpath", &zfs->rootpath, OPT_STRPTR,
@@ -547,7 +550,8 @@ pool_init(zfs_opt_t *zfs)
{
uint64_t dnid;
- zfs->poolguid = randomguid();
+ if (zfs->poolguid == 0)
+ zfs->poolguid = randomguid();
zfs->vdevguid = randomguid();
zfs->mos = objset_alloc(zfs, DMU_OST_META);
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