diff --git a/examples/ui.cpp b/examples/ui.cpp
index 1478bb8f..a1c59939 100644
--- a/examples/ui.cpp
+++ b/examples/ui.cpp
@@ -61,7 +61,7 @@ struct ui_example
 void ui_example::present()
 {
 	gl::ClearColor(0.8f, 0.8f, 0.8f, 1.f);
-	gl::Clear(gl::COLOR_BUFFER_BIT);
+	gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT);
 
 	gfx::render_target rt;
 	rt.framebuffer = &gfx::framebuffer::null();