diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index add7c0c..b1a6d62 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -722,6 +722,8 @@ static void parse_extended_opts(struct
ext2_super_block *param,
                        bpg = param->s_blocks_per_group;
                        if (!bpg)
                                bpg = blocksize * 8;
+                       if (!param->s_desc_size &&
(param->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT))
+                               param->s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
                        gdpb = EXT2_DESC_PER_BLOCK(param);