diff --git a/gfx/layers/wr/StackingContextHelper.cpp b/gfx/layers/wr/StackingContextHelper.cpp
index 78c663dea082..fb900957ef67 100644
--- a/gfx/layers/wr/StackingContextHelper.cpp
+++ b/gfx/layers/wr/StackingContextHelper.cpp
@@ -92,16 +92,16 @@ StackingContextHelper::StackingContextHelper(const StackingContextHelper& aParen
     mTransform = *aTransformPtr;
   }
 
+  // Apply the inherited scale from parent
+  mTransform.PostScale(aParentSC.mXScale, aParentSC.mYScale, 1.0);
+  mTransform.NudgeToIntegersFixedEpsilon();
+
   bool is2d = !aTransformPtr || (aTransformPtr->Is2D() && !aPerspectivePtr);
   if (is2d) {
     nsRect itemBounds = aDisplayList->GetClippedBoundsWithRespectToASR(aDisplayListBuilder, aItem->GetActiveScrolledRoot());
     nsRect childrenVisible = aItem->GetVisibleRectForChildren();
     visibleRect = itemBounds.Intersect(childrenVisible);
 
-    // Apply the inherited scale from parent
-    mTransform.PostScale(aParentSC.mXScale, aParentSC.mYScale, 1.0);
-    mTransform.NudgeToIntegersFixedEpsilon();
-
     gfx::Size scale = mTransform.As2D().ScaleFactors(true);
 
     // Restore the scale to default if the scale is too small