--- a/dom/ipc/ContentParent.cpp
+++ b/dom/ipc/ContentParent.cpp
@@ -182,16 +182,17 @@
 #include "nsHostObjectProtocolHandler.h"
 #include "nsICaptivePortalService.h"
 
 #include "nsIBidiKeyboard.h"
 
 #include "nsLayoutStylesheetCache.h"
 
 #include "ContentPrefs.h"
+#include "mozilla/Sprintf.h"
 
 #ifdef MOZ_WEBRTC
 #include "signaling/src/peerconnection/WebrtcGlobalParent.h"
 #endif
 
 #if defined(ANDROID) || defined(LINUX)
 #include "nsSystemInfo.h"
 #endif