diff --git a/quic/quartc/counting_packet_filter.h b/quic/quartc/counting_packet_filter.h
index 9df006c..32feffc 100644
--- a/quic/quartc/counting_packet_filter.h
+++ b/quic/quartc/counting_packet_filter.h
@@ -5,7 +5,8 @@
 #ifndef QUICHE_QUIC_QUARTC_COUNTING_PACKET_FILTER_H_
 #define QUICHE_QUIC_QUARTC_COUNTING_PACKET_FILTER_H_
 
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
+#include <string>
+
 #include "net/third_party/quiche/src/quic/test_tools/simulator/packet_filter.h"
 #include "net/third_party/quiche/src/quic/test_tools/simulator/port.h"
 #include "net/third_party/quiche/src/quic/test_tools/simulator/simulator.h"
diff --git a/quic/quartc/quartc_crypto_helpers.h b/quic/quartc/quartc_crypto_helpers.h
index c53a58e..2dba7ac 100644
--- a/quic/quartc/quartc_crypto_helpers.h
+++ b/quic/quartc/quartc_crypto_helpers.h
@@ -5,6 +5,8 @@
 #ifndef QUICHE_QUIC_QUARTC_QUARTC_CRYPTO_HELPERS_H_
 #define QUICHE_QUIC_QUARTC_QUARTC_CRYPTO_HELPERS_H_
 
+#include <string>
+
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_handshake_message.h"
 #include "net/third_party/quiche/src/quic/core/crypto/proof_source.h"
 #include "net/third_party/quiche/src/quic/core/crypto/proof_verifier.h"
@@ -15,7 +17,6 @@
 #include "net/third_party/quiche/src/quic/core/quic_versions.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_reference_counted.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
 
 namespace quic {
diff --git a/quic/quartc/quartc_endpoint.h b/quic/quartc/quartc_endpoint.h
index abf056a..c78641f 100644
--- a/quic/quartc/quartc_endpoint.h
+++ b/quic/quartc/quartc_endpoint.h
@@ -5,10 +5,11 @@
 #ifndef QUICHE_QUIC_QUARTC_QUARTC_ENDPOINT_H_
 #define QUICHE_QUIC_QUARTC_QUARTC_ENDPOINT_H_
 
+#include <string>
+
 #include "net/third_party/quiche/src/quic/core/quic_alarm_factory.h"
 #include "net/third_party/quiche/src/quic/core/quic_error_codes.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_clock.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_connection_helper.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_crypto_helpers.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_dispatcher.h"
diff --git a/quic/quartc/quartc_fakes.h b/quic/quartc/quartc_fakes.h
index 1719065..17e3874 100644
--- a/quic/quartc/quartc_fakes.h
+++ b/quic/quartc/quartc_fakes.h
@@ -5,10 +5,11 @@
 #ifndef QUICHE_QUIC_QUARTC_QUARTC_FAKES_H_
 #define QUICHE_QUIC_QUARTC_QUARTC_FAKES_H_
 
+#include <string>
+
 #include "net/third_party/quiche/src/quic/core/quic_error_codes.h"
 #include "net/third_party/quiche/src/quic/core/quic_types.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_clock.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_endpoint.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_session.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_stream.h"
diff --git a/quic/quartc/quartc_stream_test.cc b/quic/quartc/quartc_stream_test.cc
index 6fa1076..3b5458c 100644
--- a/quic/quartc/quartc_stream_test.cc
+++ b/quic/quartc/quartc_stream_test.cc
@@ -5,6 +5,7 @@
 #include "net/third_party/quiche/src/quic/quartc/quartc_stream.h"
 
 #include <memory>
+#include <string>
 #include <type_traits>
 #include <utility>
 
@@ -33,7 +34,6 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_ip_address.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_test_mem_slice_vector.h"
 #include "net/third_party/quiche/src/quic/quartc/quartc_factory.h"
diff --git a/quic/quartc/simulated_packet_transport.h b/quic/quartc/simulated_packet_transport.h
index 5216bbb..185668b 100644
--- a/quic/quartc/simulated_packet_transport.h
+++ b/quic/quartc/simulated_packet_transport.h
@@ -5,7 +5,8 @@
 #ifndef QUICHE_QUIC_QUARTC_SIMULATED_PACKET_TRANSPORT_H_
 #define QUICHE_QUIC_QUARTC_SIMULATED_PACKET_TRANSPORT_H_
 
-#include "net/third_party/quiche/src/quic/platform/api/quic_string.h"
+#include <string>
+
 #include "net/third_party/quiche/src/quic/quartc/quartc_packet_writer.h"
 #include "net/third_party/quiche/src/quic/test_tools/simulator/port.h"
 #include "net/third_party/quiche/src/quic/test_tools/simulator/queue.h"