--- a/devtools/server/actors/animation.js
+++ b/devtools/server/actors/animation.js
@@ -394,16 +394,17 @@ var AnimationPlayerActor = protocol.Acto
         // at least).
         const newState = this.getState();
         const oldState = this.currentState;
         hasChanged = newState.delay !== oldState.delay ||
                      newState.iterationCount !== oldState.iterationCount ||
                      newState.iterationStart !== oldState.iterationStart ||
                      newState.duration !== oldState.duration ||
                      newState.endDelay !== oldState.endDelay ||
+                     newState.direction !== oldState.direction ||
                      newState.playbackRate !== oldState.playbackRate;
         break;
       }
     }
 
     if (hasChanged) {
       this.emit("changed", this.getCurrentState());
     }