diff --git a/common/buf/io.go b/common/buf/io.go
index 6b35052d2..4f0e64f99 100644
--- a/common/buf/io.go
+++ b/common/buf/io.go
@@ -73,7 +73,7 @@ func (r *TimeoutWrapperReader) ReadMultiBufferTimeout(duration time.Duration) (M
 		}
 		return r.mb, r.err
 	case <-timeout:
-		return nil, nil
+		return nil, ErrReadTimeout
 	}
 }