diff --git a/block/src/lib.rs b/block/src/lib.rs
index c02b315cc..2c8556c39 100644
--- a/block/src/lib.rs
+++ b/block/src/lib.rs
@@ -621,15 +621,18 @@ impl Request {
                 }
 
                 let mut wz_sector = [0u8; 8];
-
                 let mut wz_num_sectors = [0u8; 4];
+                let mut wz_flags = [0u8; 4];
                 mem.read_slice(&mut wz_sector, data_addr)
                     .map_err(ExecuteError::Read)?;
                 mem.read_slice(&mut wz_num_sectors, data_addr.checked_add(8).unwrap())
                     .map_err(ExecuteError::Read)?;
+                mem.read_slice(&mut wz_flags, data_addr.checked_add(12).unwrap())
+                    .map_err(ExecuteError::Read)?;
 
                 let wz_sector = u64::from_le_bytes(wz_sector);
                 let wz_num_sectors = u32::from_le_bytes(wz_num_sectors);
+                let wz_flags = u32::from_le_bytes(wz_flags);
 
                 let wz_offset = wz_sector * SECTOR_SIZE;
                 if wz_offset == 0 && disable_sector0_writes {
@@ -637,9 +640,15 @@ impl Request {
                 }
                 let wz_length = (wz_num_sectors as u64) * SECTOR_SIZE;
 
-                disk_image
-                    .write_zeroes(wz_offset, wz_length, user_data)
-                    .map_err(ExecuteError::AsyncWriteZeroes)?;
+                if wz_flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP != 0 {
+                    disk_image
+                        .punch_hole(wz_offset, wz_length, user_data)
+                        .map_err(ExecuteError::AsyncPunchHole)?;
+                } else {
+                    disk_image
+                        .write_zeroes(wz_offset, wz_length, user_data)
+                        .map_err(ExecuteError::AsyncWriteZeroes)?;
+                }
             }
             RequestType::Unsupported(t) => return Err(ExecuteError::Unsupported(t)),
         }