--- a/layout/style/nsStyleStruct.cpp
+++ b/layout/style/nsStyleStruct.cpp
@@ -3576,17 +3576,16 @@ nsStyleDisplay::nsStyleDisplay(const nsP
   , mOverscrollBehaviorY(StyleOverscrollBehavior::Auto)
   , mScrollSnapTypeX(NS_STYLE_SCROLL_SNAP_TYPE_NONE)
   , mScrollSnapTypeY(NS_STYLE_SCROLL_SNAP_TYPE_NONE)
   , mScrollSnapPointsX(eStyleUnit_None)
   , mScrollSnapPointsY(eStyleUnit_None)
   , mBackfaceVisibility(NS_STYLE_BACKFACE_VISIBILITY_VISIBLE)
   , mTransformStyle(NS_STYLE_TRANSFORM_STYLE_FLAT)
   , mTransformBox(StyleGeometryBox::BorderBox)
-  , mSpecifiedTransform(nullptr)
   , mTransformOrigin{ {0.5f, eStyleUnit_Percent}, // Transform is centered on origin
                       {0.5f, eStyleUnit_Percent},
                       {0, nsStyleCoord::CoordConstructor} }
   , mChildPerspective(eStyleUnit_None)
   , mPerspectiveOrigin{ {0.5f, eStyleUnit_Percent},
                         {0.5f, eStyleUnit_Percent} }
   , mVerticalAlign(NS_STYLE_VERTICAL_ALIGN_BASELINE, eStyleUnit_Enumerated)
   , mTransitions(nsStyleAutoArray<StyleTransition>::WITH_SINGLE_INITIAL_ELEMENT)