diff --git a/quic/platform/api/quic_hostname_utils.cc b/quic/platform/api/quic_hostname_utils.cc
index d02529f..b7e4642 100644
--- a/quic/platform/api/quic_hostname_utils.cc
+++ b/quic/platform/api/quic_hostname_utils.cc
@@ -12,7 +12,7 @@
 }
 
 // static
-QuicString QuicHostnameUtils::NormalizeHostname(QuicStringPiece hostname) {
+std::string QuicHostnameUtils::NormalizeHostname(QuicStringPiece hostname) {
   return QuicHostnameUtilsImpl::NormalizeHostname(hostname);
 }