diff --git a/block/src/io/request.rs b/block/src/io/request.rs
index 0db5e710f..74e3ba574 100644
--- a/block/src/io/request.rs
+++ b/block/src/io/request.rs
@@ -428,11 +428,6 @@ impl Request {
                     });
                 }
 
-                let wz_offset = wz_sector * SECTOR_SIZE;
-                if wz_offset == 0 && disable_sector0_writes {
-                    return Err(ExecuteError::BadRequest(Error::InvalidOffset));
-                }
-
                 let top = wz_sector
                     .checked_add(wz_num_sectors as u64)
                     .ok_or(ExecuteError::BadRequest(Error::InvalidOffset))?;
@@ -440,6 +435,11 @@ impl Request {
                     return Err(ExecuteError::BadRequest(Error::InvalidOffset));
                 }
 
+                let wz_offset = wz_sector * SECTOR_SIZE;
+                if wz_offset == 0 && disable_sector0_writes {
+                    return Err(ExecuteError::BadRequest(Error::InvalidOffset));
+                }
+
                 let wz_length = (wz_num_sectors as u64) * SECTOR_SIZE;
 
                 if wz_flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP != 0 {