diff --git a/pc/peer_connection.h b/pc/peer_connection.h
index 37f8df0012..aac1635484 100644
--- a/pc/peer_connection.h
+++ b/pc/peer_connection.h
@@ -80,7 +80,6 @@
 #include "rtc_base/rtc_certificate.h"
 #include "rtc_base/ssl_certificate.h"
 #include "rtc_base/ssl_stream_adapter.h"
-#include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"
 #include "rtc_base/thread_annotations.h"
 #include "rtc_base/weak_ptr.h"
diff --git a/pc/rtp_transmission_manager.h b/pc/rtp_transmission_manager.h
index b41848c917..5a4bf83526 100644
--- a/pc/rtp_transmission_manager.h
+++ b/pc/rtp_transmission_manager.h
@@ -35,7 +35,6 @@
 #include "pc/rtp_transceiver.h"
 #include "pc/transceiver_list.h"
 #include "pc/usage_pattern.h"
-#include "rtc_base/third_party/sigslot/sigslot.h"
 #include "rtc_base/thread.h"
 #include "rtc_base/thread_annotations.h"
 #include "rtc_base/weak_ptr.h"