--- a/dom/base/Navigator.cpp
+++ b/dom/base/Navigator.cpp
@@ -48,16 +48,17 @@
 #include "mozilla/dom/StorageManager.h"
 #include "mozilla/dom/TCPSocket.h"
 #include "mozilla/dom/Telephony.h"
 #include "mozilla/dom/VRDisplay.h"
 #include "mozilla/dom/workers/RuntimeService.h"
 #include "mozilla/Hal.h"
 #include "nsISiteSpecificUserAgent.h"
 #include "mozilla/ClearOnShutdown.h"
+#include "mozilla/SSE.h"
 #include "mozilla/StaticPtr.h"
 #include "Connection.h"
 #include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
 #include "nsGlobalWindow.h"
 #ifdef MOZ_B2G_RIL
 #include "mozilla/dom/MobileConnectionArray.h"
 #endif
 #include "nsIIdleObserver.h"