--- a/layout/generic/nsFrame.cpp
+++ b/layout/generic/nsFrame.cpp
@@ -3584,18 +3584,18 @@ void nsIFrame::BuildDisplayListForChild(
   // SVG effects or a blend mode..
   const nsStyleDisplay* disp = child->StyleDisplay();
   const nsStyleEffects* effects = child->StyleEffects();
   const nsStylePosition* pos = child->StylePosition();
 
   const bool isPositioned = disp->IsAbsPosContainingBlock(child);
 
   const bool isStackingContext =
-      child->IsStackingContext(disp, pos, effects, isPositioned) ||
-      (aFlags & DISPLAY_CHILD_FORCE_STACKING_CONTEXT);
+      (aFlags & DISPLAY_CHILD_FORCE_STACKING_CONTEXT) ||
+      child->IsStackingContext(disp, pos, effects, isPositioned);
 
   if (pseudoStackingContext || isStackingContext || isPositioned ||
       isPlaceholder || (!isSVG && disp->IsFloating(child)) ||
       (isSVG && (effects->mClipFlags & NS_STYLE_CLIP_RECT) &&
        IsSVGContentWithCSSClip(child))) {
     pseudoStackingContext = true;
     awayFromCommonPath = true;
   }