| Index: sdk/lib/io/file_impl.dart | 
| diff --git a/sdk/lib/io/file_impl.dart b/sdk/lib/io/file_impl.dart | 
| index 83952b17ee5a6e747c0fe877ca6cc8fa171cb272..87f3204146923004fad04b666f80e7073b8a14b2 100644 | 
| --- a/sdk/lib/io/file_impl.dart | 
| +++ b/sdk/lib/io/file_impl.dart | 
| @@ -736,7 +736,7 @@ class _RandomAccessFile extends _FileBase implements RandomAccessFile { | 
| } | 
| var read = response[1]; | 
| var data = response[2]; | 
| -      buffer.setRange(offset, read, data); | 
| +      buffer.setRange(offset, offset + read, data); | 
| return read; | 
| }); | 
| } | 
|  |