diff --git a/module/zfs/range_tree.c b/module/zfs/range_tree.c
index 5dd490a57..373636c69 100644
--- a/module/zfs/range_tree.c
+++ b/module/zfs/range_tree.c
@@ -659,7 +659,7 @@ zfs_range_tree_find_in(zfs_range_tree_t *rt, uint64_t start, uint64_t size,
 	}
 
 	rs = zfs_btree_next(&rt->rt_root, &where, &where);
-	if (rs == NULL || zfs_rs_get_start(rs, rt) > start + size)
+	if (rs == NULL || zfs_rs_get_start(rs, rt) >= start + size)
 		return (B_FALSE);
 
 	*ostart = zfs_rs_get_start(rs, rt);