diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5
index 9d5735bd4347..822146a7aafd 100644
--- a/man/man5/zfs-module-parameters.5
+++ b/man/man5/zfs-module-parameters.5
@@ -1143,6 +1143,17 @@ Maximum number of blocks freed in a single txg.
 Default value: \fB100,000\fR.
 .RE
 
+.sp
+.ne 2
+.na
+\fBzfs_override_estimate_recordsize\fR (ulong)
+.ad
+.RS 12n
+Record size calculation override for zfs send estimates.
+.sp
+Default value: \fB0\fR.
+.RE
+
 .sp
 .ne 2
 .na
diff --git a/module/zfs/dmu_send.c b/module/zfs/dmu_send.c
index 9422f3444f69..9b61602549b4 100644
--- a/module/zfs/dmu_send.c
+++ b/module/zfs/dmu_send.c
@@ -69,6 +69,11 @@ int zfs_send_set_freerecords_bit = B_TRUE;
 static char *dmu_recv_tag = "dmu_recv_tag";
 const char *recv_clone_name = "%recv";
 
+/*
+ * Use this to override the recordsize calculation for fast zfs send estimates.
+ */
+unsigned long zfs_override_estimate_recordsize = 0;
+
 #define	BP_SPAN(datablkszsec, indblkshift, level) \
 	(((uint64_t)datablkszsec) << (SPA_MINBLOCKSHIFT + \
 	(level) * (indblkshift - SPA_BLKPTRSHIFT)))
@@ -1360,7 +1365,7 @@ static int
 dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t uncompressed,
     uint64_t compressed, boolean_t stream_compressed, uint64_t *sizep)
 {
-	int err;
+	int err = 0;
 	uint64_t size;
 	/*
 	 * Assume that space (both on-disk and in-stream) is dominated by
@@ -1374,7 +1379,9 @@ dmu_adjust_send_estimate_for_indirects(dsl_dataset_t *ds, uint64_t uncompressed,
 	VERIFY0(dmu_objset_from_ds(ds, &os));
 
 	/* Assume all (uncompressed) blocks are recordsize. */
-	if (os->os_phys->os_type == DMU_OST_ZVOL) {
+	if (zfs_override_estimate_recordsize != 0) {
+		recordsize = zfs_override_estimate_recordsize;
+	} else if (os->os_phys->os_type == DMU_OST_ZVOL) {
 		err = dsl_prop_get_int_ds(ds,
 		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &recordsize);
 	} else {
@@ -4223,6 +4230,12 @@ dmu_objset_is_receiving(objset_t *os)
 }
 
 #if defined(_KERNEL)
+/* BEGIN CSTYLED */
+module_param(zfs_override_estimate_recordsize, ulong, 0644);
+MODULE_PARM_DESC(zfs_override_estimate_recordsize,
+	"Record size calculation override for zfs send estimates");
+/* END CSTYLED */
+
 module_param(zfs_send_corrupt_data, int, 0644);
 MODULE_PARM_DESC(zfs_send_corrupt_data, "Allow sending corrupt data");
 
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_006_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_006_pos.ksh
index 1fe10a760def..7192551b6c5d 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_006_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_006_pos.ksh
@@ -37,7 +37,7 @@ verify_runnable "both"
 function cleanup
 {
 	for ds in $datasets; do
-                datasetexists $ds && zfs destroy -rf $ds
+                destroy_dataset $ds "-rf"
 	done
 }