diff --git a/quic/core/quic_data_writer.cc b/quic/core/quic_data_writer.cc
index 7116853..42f1e4e 100644
--- a/quic/core/quic_data_writer.cc
+++ b/quic/core/quic_data_writer.cc
@@ -196,6 +196,14 @@
   return true;
 }
 
+bool QuicDataWriter::Seek(size_t length) {
+  if (!BeginWrite(length)) {
+    return false;
+  }
+  length_ += length;
+  return true;
+}
+
 // Converts a uint64_t into an IETF/Quic formatted Variable Length
 // Integer. IETF Variable Length Integers have 62 significant bits, so
 // the value to write must be in the range of 0..(2^62)-1.