diff --git a/webrtc/TwccContext.h b/webrtc/TwccContext.h
index 76334a2c..893c3042 100644
--- a/webrtc/TwccContext.h
+++ b/webrtc/TwccContext.h
@@ -13,6 +13,7 @@
 
 #include <stdint.h>
 #include <map>
+#include <functional>
 #include "Util/TimeTicker.h"
 using namespace toolkit;