diff --git a/dom/media/MediaPrefs.h b/dom/media/MediaPrefs.h
index 3b41ee87caa6..9138ac1aa594 100644
--- a/dom/media/MediaPrefs.h
+++ b/dom/media/MediaPrefs.h
@@ -194,8 +194,6 @@ private:
   // resume background video decoding when the cursor is hovering over the tab.
   DECL_MEDIA_PREF("media.resume-bkgnd-video-on-tabhover",     ResumeVideoDecodingOnTabHover, bool, false);
 
-  // Enable sandboxing support for cubeb
-  DECL_MEDIA_PREF("media.cubeb.sandbox",                      CubebSandbox, bool, false);
   DECL_MEDIA_PREF("media.videocontrols.lock-video-orientation",  VideoOrientationLockEnabled, bool, false);
 
   // Media Seamless Looping