$OpenBSD: patch-ui_views_window_custom_frame_view_cc,v 1.10 2018/05/04 07:14:58 robert Exp $
Index: ui/views/window/custom_frame_view.cc
--- ui/views/window/custom_frame_view.cc.orig
+++ ui/views/window/custom_frame_view.cc
@@ -301,7 +301,7 @@ int CustomFrameView::NonClientTopBorderHeight() const 
 int CustomFrameView::CaptionButtonY() const {
   // Maximized buttons start at window top so that even if their images aren't
   // drawn flush with the screen edge, they still obey Fitts' Law.
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+#if (defined(OS_BSD) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
   return FrameBorderThickness();
 #else
   return frame_->IsMaximized() ? FrameBorderThickness() : kFrameShadowThickness;
