diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index d8f393e9c5..3843d2cc3f 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -580,7 +580,7 @@ pref("media.mediasource.webm.enabled", true);
 pref("media.mediasource.webm.audio.enabled", true);
 
 #ifdef MOZ_AV1
-pref("media.av1.enabled", false);
+pref("media.av1.enabled", true);
 #endif
 
 // Use new MediaFormatReader architecture for plain ogg.