diff --git a/dom/animation/AnimationPlayer.cpp b/dom/animation/AnimationPlayer.cpp
index 6220d9e52087..2ec7bb872528 100644
--- a/dom/animation/AnimationPlayer.cpp
+++ b/dom/animation/AnimationPlayer.cpp
@@ -56,7 +56,7 @@ AnimationPlayer::PlayFromJS()
 void
 AnimationPlayer::PauseFromJS()
 {
-  Play();
+  Pause();
 
   // TODO (flush styles etc.)
 }
diff --git a/dom/animation/AnimationPlayer.h b/dom/animation/AnimationPlayer.h
index e85e102e43eb..f323cab448b0 100644
--- a/dom/animation/AnimationPlayer.h
+++ b/dom/animation/AnimationPlayer.h
@@ -31,7 +31,7 @@ protected:
 
 public:
   explicit AnimationPlayer(AnimationTimeline* aTimeline)
-    : mPlayState(NS_STYLE_ANIMATION_PLAY_STATE_RUNNING)
+    : mIsPaused(false)
     , mIsRunningOnCompositor(false)
     , mTimeline(aTimeline)
   {
@@ -64,9 +64,7 @@ public:
     return mSource ? mSource->Name() : EmptyString();
   }
 
-  bool IsPaused() const {
-    return mPlayState == NS_STYLE_ANIMATION_PLAY_STATE_PAUSED;
-  }
+  bool IsPaused() const { return mIsPaused; }
 
   bool IsRunning() const;
 
@@ -84,7 +82,7 @@ public:
   // The beginning of the delay period.
   Nullable<TimeDuration> mStartTime;
   Nullable<TimeDuration> mHoldTime;
-  uint8_t mPlayState;
+  bool mIsPaused;
   bool mIsRunningOnCompositor;
 
   nsRefPtr<AnimationTimeline> mTimeline;
diff --git a/layout/style/nsAnimationManager.cpp b/layout/style/nsAnimationManager.cpp
index dd10ff34f2b1..de0f566d7a7a 100644
--- a/layout/style/nsAnimationManager.cpp
+++ b/layout/style/nsAnimationManager.cpp
@@ -324,7 +324,7 @@ nsAnimationManager::CheckAnimationRule(nsStyleContext* aStyleContext,
             }
             oldPlayer->mHoldTime.SetNull();
           }
-          oldPlayer->mPlayState = newPlayer->mPlayState;
+          oldPlayer->mIsPaused = newPlayer->mIsPaused;
 
           // Replace new animation with the (updated) old one and remove the
           // old one from the array so we don't try to match it any more.
@@ -459,7 +459,8 @@ nsAnimationManager::BuildAnimations(nsStyleContext* aStyleContext,
     dest->SetSource(destAnim);
 
     dest->mStartTime = now;
-    dest->mPlayState = src.GetPlayState();
+    dest->mIsPaused =
+      src.GetPlayState() == NS_STYLE_ANIMATION_PLAY_STATE_PAUSED;
     if (dest->IsPaused()) {
       dest->mHoldTime.SetValue(TimeDuration(0));
     }