diff --git a/widget/cocoa/nsCocoaWindow.mm b/widget/cocoa/nsCocoaWindow.mm
index b965ee108d74..c7338e94dd43 100644
--- a/widget/cocoa/nsCocoaWindow.mm
+++ b/widget/cocoa/nsCocoaWindow.mm
@@ -4609,12 +4609,15 @@ nsresult nsCocoaWindow::Create(nsIWidget* aParent, const DesktopIntRect& aRect,
       initWithFrame:mWindow.childViewFrameRectForCurrentBounds
          geckoChild:this];
   mChildView.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
-  [contentView addSubview:mChildView];
 
   mNativeLayerRoot =
       NativeLayerRootCA::CreateForCALayer(mChildView.rootCALayer);
   mNativeLayerRoot->SetBackingScale(BackingScaleFactor());
 
+  // Link mChildView into the native NSView hierarchy only after
+  // mNativeLayerRoot is initialized. This resolves bug 1986701.
+  [contentView addSubview:mChildView];
+
   [WindowDataMap.sharedWindowDataMap ensureDataForWindow:mWindow];
 
   NS_ASSERTION(!mTextInputHandler, "mTextInputHandler has already existed");