diff --git a/Quik.OpenTK/OpenTKPort.cs b/Quik.OpenTK/OpenTKPort.cs
index f0206b1..c38dfe1 100644
--- a/Quik.OpenTK/OpenTKPort.cs
+++ b/Quik.OpenTK/OpenTKPort.cs
@@ -78,7 +78,7 @@ namespace Quik.OpenTK
             if (!_glDriver.IsInit)
                 _glDriver.Init();
 
-            GL.Clear(GLEnum.GL_COLOR_BUFFER_BIT);
+            GL.Clear(GLEnum.GL_COLOR_BUFFER_BIT | GLEnum.GL_DEPTH_BUFFER_BIT);
             _glDriver.Draw(_vertexEngine.DrawQueue, view);
 
             _window.Context.SwapBuffers();
diff --git a/Quik/OpenGL/GLEnum.cs b/Quik/OpenGL/GLEnum.cs
index 89b5213..550fb0b 100644
--- a/Quik/OpenGL/GLEnum.cs
+++ b/Quik/OpenGL/GLEnum.cs
@@ -21,6 +21,7 @@ namespace Quik.OpenGL
         GL_BLEND = 0x0BE2,
 
         GL_COLOR_BUFFER_BIT = 0x00004000,
+        GL_DEPTH_BUFFER_BIT = 0x00000100,
 
         GL_SRC_ALPHA = 0x0302,
         GL_ONE_MINUS_SRC_ALPHA = 0x0303,