diff --git a/gfx/layers/CompositorAnimationStorage.cpp b/gfx/layers/CompositorAnimationStorage.cpp
index b8ccd49fe8ea..ea34d011a0db 100644
--- a/gfx/layers/CompositorAnimationStorage.cpp
+++ b/gfx/layers/CompositorAnimationStorage.cpp
@@ -152,8 +152,8 @@ void CompositorAnimationStorage::SetAnimatedValue(
   if (!aPreviousValue) {
     MOZ_ASSERT(!mAnimatedValues.Contains(aId));
     mAnimatedValues.InsertOrUpdate(
-        aId, MakeUnique<AnimatedValue>(gfx::Matrix4x4(), aFrameTransform, aData,
-                                       std::move(aValue)));
+        aId,
+        MakeUnique<AnimatedValue>(aFrameTransform, aData, std::move(aValue)));
     return;
   }
   MOZ_ASSERT(aPreviousValue->Is<AnimationTransform>());
diff --git a/gfx/layers/CompositorAnimationStorage.h b/gfx/layers/CompositorAnimationStorage.h
index 41fe07424f08..55d892b36382 100644
--- a/gfx/layers/CompositorAnimationStorage.h
+++ b/gfx/layers/CompositorAnimationStorage.h
@@ -28,11 +28,6 @@ using AnimationArray = nsTArray<layers::Animation>;
 using SampledAnimationArray = AutoTArray<RefPtr<StyleAnimationValue>, 1>;
 
 struct AnimationTransform {
-  /*
-   * This transform is calculated from sampleanimation in device pixel
-   * and used for layers (i.e. non WebRender)
-   */
-  gfx::Matrix4x4 mTransformInDevSpace;
   /*
    * This transform is calculated from frame used for WebRender and used by
    * getOMTAStyle() for OMTA testing.
@@ -64,12 +59,10 @@ struct AnimatedValue final {
     return mValue.is<T>();
   }
 
-  AnimatedValue(const gfx::Matrix4x4& aTransformInDevSpace,
-                const gfx::Matrix4x4& aFrameTransform,
+  AnimatedValue(const gfx::Matrix4x4& aFrameTransform,
                 const TransformData& aData, SampledAnimationArray&& aValue)
-      : mValue(AsVariant(AnimationTransform{
-            aTransformInDevSpace, aFrameTransform, aData, std::move(aValue)})) {
-  }
+      : mValue(AsVariant(
+            AnimationTransform{aFrameTransform, aData, std::move(aValue)})) {}
 
   explicit AnimatedValue(const float& aValue) : mValue(AsVariant(aValue)) {}