diff --git a/quic/core/quic_packet_number.h b/quic/core/quic_packet_number.h
index 5348abd..0cf7f15 100644
--- a/quic/core/quic_packet_number.h
+++ b/quic/core/quic_packet_number.h
@@ -10,7 +10,6 @@
 #include <string>
 
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
-#include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"