diff --git a/block/vhdx.c b/block/vhdx.c index f1e1e2e..bec10bd 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1111,6 +1111,7 @@ static coroutine_fn int vhdx_co_readv(BlockDriverState *bs, int64_t sector_num,
             case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */
             case PAYLOAD_BLOCK_UNDEFINED:
             case PAYLOAD_BLOCK_UNMAPPED:
+            case PAYLOAD_BLOCK_UNMAPPED_v095:
             case PAYLOAD_BLOCK_ZERO:
                 /* return zero */
                 qemu_iovec_memset(&hd_qiov, 0, 0, sinfo.bytes_avail);
@@ -1277,10 +1278,10 @@ static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num,
                         sectors_to_write += iov2.iov_len >> BDRV_SECTOR_BITS;
                     }
                 }
-
                 /* fall through */
             case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */
             case PAYLOAD_BLOCK_UNMAPPED:
+            case PAYLOAD_BLOCK_UNMAPPED_v095:
             case PAYLOAD_BLOCK_UNDEFINED:
                 bat_prior_offset = sinfo.file_offset;
                 ret = vhdx_allocate_block(bs, s, &sinfo.file_offset); diff --git a/block/vhdx.h b/block/vhdx.h index b4a12a0..7003ab7 100644
--- a/block/vhdx.h
+++ b/block/vhdx.h
@@ -226,7 +226,8 @@ typedef struct QEMU_PACKED VHDXLogDataSector {
 #define PAYLOAD_BLOCK_NOT_PRESENT       0
 #define PAYLOAD_BLOCK_UNDEFINED         1
 #define PAYLOAD_BLOCK_ZERO              2
-#define PAYLOAD_BLOCK_UNMAPPED          5
+#define PAYLOAD_BLOCK_UNMAPPED          3
+#define PAYLOAD_BLOCK_UNMAPPED_v095     5
 #define PAYLOAD_BLOCK_FULLY_PRESENT     6
 #define PAYLOAD_BLOCK_PARTIALLY_PRESENT 7