diff --git a/p2p/base/datagram_dtls_adaptor.cc b/p2p/base/datagram_dtls_adaptor.cc
index a6e7d30..add07a1 100644
--- a/p2p/base/datagram_dtls_adaptor.cc
+++ b/p2p/base/datagram_dtls_adaptor.cc
@@ -25,7 +25,6 @@
 #include "rtc_base/buffer.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/dscp.h"
-#include "rtc_base/flags.h"
 #include "rtc_base/logging.h"
 #include "rtc_base/message_queue.h"
 #include "rtc_base/rtc_certificate.h"