diff --git a/module/zfs/vdev_raidz_math.c b/module/zfs/vdev_raidz_math.c
index 25d76970e9..2ce0dc5cc7 100644
--- a/module/zfs/vdev_raidz_math.c
+++ b/module/zfs/vdev_raidz_math.c
@@ -465,6 +465,7 @@ benchmark_raidz(void)
 	raidz_supp_impl_cnt = c;	/* number of supported impl */
 
 #if defined(_KERNEL)
+	abd_t *pabd;
 	zio_t *bench_zio = NULL;
 	raidz_map_t *bench_rm = NULL;
 	uint64_t bench_parity;
@@ -492,6 +493,12 @@ benchmark_raidz(void)
 	bench_rm = vdev_raidz_map_alloc(bench_zio, SPA_MINBLOCKSHIFT,
 	    BENCH_COLS, PARITY_PQR);
 
+	/* Ensure that fake parity blocks are initialized */
+	for (c = 0; c < bench_rm->rm_row[0]->rr_firstdatacol; c++) {
+		pabd = bench_rm->rm_row[0]->rr_col[c].rc_abd;
+		memset(abd_to_buf(pabd), 0xAA, abd_get_size(pabd));
+	}
+
 	for (int fn = 0; fn < RAIDZ_REC_NUM; fn++)
 		benchmark_raidz_impl(bench_rm, fn, benchmark_rec_impl);