--- a/gfx/layers/wr/StackingContextHelper.cpp
+++ b/gfx/layers/wr/StackingContextHelper.cpp
@@ -59,13 +59,15 @@ StackingContextHelper::~StackingContextH
   if (mBuilder) {
     mBuilder->PopStackingContext();
   }
 }
 
 wr::LayoutRect
 StackingContextHelper::ToRelativeLayoutRect(const LayoutDeviceRect& aRect) const
 {
-  return wr::ToLayoutRect(RoundedToInt(aRect - mOrigin));
+  auto rect = aRect - mOrigin;
+  rect.Round();
+  return wr::ToLayoutRect(rect);
 }
 
 } // namespace layers
 } // namespace mozilla