diff --git a/quic/core/quic_utils.h b/quic/core/quic_utils.h
index 28ea15b..3ef4788 100644
--- a/quic/core/quic_utils.h
+++ b/quic/core/quic_utils.h
@@ -57,7 +57,7 @@
   static const char* TransmissionTypeToString(TransmissionType type);
 
   // Returns AddressChangeType as a string.
-  static QuicString AddressChangeTypeToString(AddressChangeType type);
+  static std::string AddressChangeTypeToString(AddressChangeType type);
 
   // Returns SentPacketState as a char*.
   static const char* SentPacketStateToString(SentPacketState state);