diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index be155a9..c9eabcb 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -766,7 +766,7 @@
 // TODO(nharper): Change this method to take a ParsedQuicVersion.
 bool QuicFramer::IsSupportedTransportVersion(
     const QuicTransportVersion version) const {
-  for (ParsedQuicVersion supported_version : supported_versions_) {
+  for (const ParsedQuicVersion& supported_version : supported_versions_) {
     if (version == supported_version.transport_version) {
       return true;
     }