diff --git a/dom/animation/AnimationPlayer.cpp b/dom/animation/AnimationPlayer.cpp
index d81674cc3a3..01431cd5636 100644
--- a/dom/animation/AnimationPlayer.cpp
+++ b/dom/animation/AnimationPlayer.cpp
@@ -424,8 +424,6 @@ AnimationPlayer::ComposeStyle(nsRefPtr<css::AnimValuesStyleRule>& aStyleRule,
   }
 
   mSource->ComposeStyle(aStyleRule, aSetProperties);
-
-  //XXXjwatt mIsPreviousStateFinished = (playState == AnimationPlayState::Finished);
 }
 
 void