--- a/dom/media/MediaPrefs.h
+++ b/dom/media/MediaPrefs.h
@@ -206,16 +206,17 @@ private:
                                                               MediaWarningsAsErrorsStageFrightVsRust, bool, false);
 
   // resume background video decoding when the cursor is hovering over the tab.
   DECL_MEDIA_PREF("media.resume-bkgnd-video-on-tabhover",     ResumeVideoDecodingOnTabHover, bool, false);
 
 #ifdef MOZ_CUBEB_REMOTING
   DECL_MEDIA_PREF("media.cubeb.sandbox",                      CubebSandbox, bool, false);
 #endif // MOZ_CUBEB_REMOTING
+  DECL_MEDIA_PREF("media.videocontrols.lock-video-orientation",  VideoOrientationLockEnabled, bool, false);
 
 public:
   // Manage the singleton:
   static MediaPrefs& GetSingleton();
   static bool SingletonExists();
 
 private:
   template<class T> friend class StaticAutoPtr;