diff --git a/weed/storage/needle/needle_read_page.go b/weed/storage/needle/needle_read_page.go
index ab0a69739..3bdcb7368 100644
--- a/weed/storage/needle/needle_read_page.go
+++ b/weed/storage/needle/needle_read_page.go
@@ -55,6 +55,7 @@ func (n *Needle) ReadNeedleMeta(r backend.BackendStorageFile, offset int64, size
 		if OffsetSize == 4 && offset < int64(MaxPossibleVolumeSize) {
 			return ErrorSizeMismatch
 		}
+		return fmt.Errorf("size mismatch for entry at offset %d: found id %x size %d, expected size %d", offset, n.Id, n.Size, size)
 	}
 	n.DataSize = util.BytesToUint32(bytes[NeedleHeaderSize : NeedleHeaderSize+DataSizeSize])
 	startOffset := offset + NeedleHeaderSize