diff --git a/block/vhdx.c b/block/vhdx.c
index 7d1af9663b..ed6fa53b87 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1043,6 +1043,15 @@ static void vhdx_block_translate(BDRVVHDXState *s, int64_t sector_num,
 }
 
 
+static int vhdx_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+    BDRVVHDXState *s = bs->opaque;
+
+    bdi->cluster_size = s->block_size;
+
+    return 0;
+}
+
 
 static coroutine_fn int vhdx_co_readv(BlockDriverState *bs, int64_t sector_num,
                                       int nb_sectors, QEMUIOVector *qiov)
@@ -1885,6 +1894,7 @@ static BlockDriver bdrv_vhdx = {
     .bdrv_co_readv          = vhdx_co_readv,
     .bdrv_co_writev         = vhdx_co_writev,
     .bdrv_create            = vhdx_create,
+    .bdrv_get_info          = vhdx_get_info,
 
     .create_options         = vhdx_create_options,
 };
diff --git a/block/vpc.c b/block/vpc.c
index 577cc45992..551876fef7 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -455,6 +455,18 @@ fail:
     return -1;
 }
 
+static int vpc_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+    BDRVVPCState *s = (BDRVVPCState *)bs->opaque;
+    VHDFooter *footer = (VHDFooter *) s->footer_buf;
+
+    if (cpu_to_be32(footer->type) != VHD_FIXED) {
+        bdi->cluster_size = s->block_size;
+    }
+
+    return 0;
+}
+
 static int vpc_read(BlockDriverState *bs, int64_t sector_num,
                     uint8_t *buf, int nb_sectors)
 {
@@ -857,6 +869,8 @@ static BlockDriver bdrv_vpc = {
     .bdrv_read              = vpc_co_read,
     .bdrv_write             = vpc_co_write,
 
+    .bdrv_get_info          = vpc_get_info,
+
     .create_options         = vpc_create_options,
     .bdrv_has_zero_init     = vpc_has_zero_init,
 };