diff --git a/atom/browser/native_window_views.cc b/atom/browser/native_window_views.cc
index 7ad871588a..11c2436d78 100644
--- a/atom/browser/native_window_views.cc
+++ b/atom/browser/native_window_views.cc
@@ -309,9 +309,11 @@ NativeWindowViews::NativeWindowViews(
     // we should check whether setting it in InitParams can work.
     window_->set_frame_type(views::Widget::FrameType::FRAME_TYPE_FORCE_NATIVE);
     window_->FrameTypeChanged();
+#if defined(OS_WIN)
     // thickFrame also works for normal window.
     if (!thick_frame_)
       FlipWindowStyle(GetAcceleratedWidget(), false, WS_THICKFRAME);
+#endif
   }
 
   gfx::Size size = bounds.size();
@@ -580,11 +582,15 @@ gfx::Size NativeWindowViews::GetContentSize() {
 void NativeWindowViews::SetContentSizeConstraints(
     const extensions::SizeConstraints& size_constraints) {
   NativeWindow::SetContentSizeConstraints(size_constraints);
+#if defined(OS_WIN)
   // Changing size constraints would force adding the WS_THICKFRAME style, so
   // do nothing if thickFrame is false.
+  if (!thick_frame_)
+    return;
+#endif
   // widget_delegate() is only available after Init() is called, we make use of
   // this to determine whether native widget has initialized.
-  if (thick_frame_ && window_ && window_->widget_delegate())
+  if (window_ && window_->widget_delegate())
     window_->OnSizeConstraintsChanged();
 #if defined(USE_X11)
   if (resizable_)