--- a/usr/src/uts/common/fs/zfs/arc.c	Sun May 20 02:46:39 2012 -0500
+++ b/usr/src/uts/common/fs/zfs/arc.c	Mon May 21 12:11:39 2012 -0700
@@ -2547,9 +2547,11 @@
 	callback_list = hdr->b_acb;
 	ASSERT(callback_list != NULL);
 	if (BP_SHOULD_BYTESWAP(zio->io_bp) && zio->io_error == 0) {
+		dmu_object_byteswap_t bswap =
+		    DMU_OT_BYTESWAP(BP_GET_TYPE(zio->io_bp));
 		arc_byteswap_func_t *func = BP_GET_LEVEL(zio->io_bp) > 0 ?
 		    byteswap_uint64_array :
-		    dmu_ot[BP_GET_TYPE(zio->io_bp)].ot_byteswap;
+		    dmu_ot_byteswap[bswap].ob_func;
 		func(buf->b_data, hdr->b_size);
 	}