diff --git a/cmd/raidz_test/raidz_test.c b/cmd/raidz_test/raidz_test.c
index cf3e123c6..be560c57c 100644
--- a/cmd/raidz_test/raidz_test.c
+++ b/cmd/raidz_test/raidz_test.c
@@ -373,7 +373,7 @@ init_raidz_map(raidz_test_opts_t *opts, zio_t **zio, const int parity)
 
 	*zio = umem_zalloc(sizeof (zio_t), UMEM_NOFAIL);
 
-	(*zio)->io_offset = 0;
+	(*zio)->io_offset = opts->rto_offset;
 	(*zio)->io_size = alloc_dsize;
 	(*zio)->io_abd = raidz_alloc(alloc_dsize);
 	init_zio_abd(*zio);
diff --git a/cmd/raidz_test/raidz_test.h b/cmd/raidz_test/raidz_test.h
index f0b854cef..77f15e847 100644
--- a/cmd/raidz_test/raidz_test.h
+++ b/cmd/raidz_test/raidz_test.h
@@ -72,7 +72,7 @@ typedef struct raidz_test_opts {
 
 static const raidz_test_opts_t rto_opts_defaults = {
 	.rto_ashift = 9,
-	.rto_offset = 1ULL << 0,
+	.rto_offset = 0,
 	.rto_dcols = 8,
 	.rto_dsize = 1<<19,
 	.rto_v = D_ALL,