diff --git a/miniwin/src/d3drm/backends/opengl15/renderer.cpp b/miniwin/src/d3drm/backends/opengl15/renderer.cpp
index 8e12debe..3af99a75 100644
--- a/miniwin/src/d3drm/backends/opengl15/renderer.cpp
+++ b/miniwin/src/d3drm/backends/opengl15/renderer.cpp
@@ -335,6 +335,8 @@ void OpenGL15Renderer::SubmitDraw(
 
 	if (appearance.flat) {
 		glShadeModel(GL_FLAT);
+	} else {
+		glShadeModel(GL_SMOOTH);
 	}
 
 	float shininess = appearance.shininess;