diff --git a/main.swift b/main.swift
index 141b2dd..6c2961f 100644
--- a/main.swift
+++ b/main.swift
@@ -137,6 +137,7 @@ let verts = graphics.createBuffer(label: "UI vertex buffer", usage: [.vertex, .c
 let inds = graphics.createBuffer(label: "UI index buffer", usage: [.index, .copyDest], size: 1024 * 1024)
 var drawable = Drawable(passes: ["ui"], vertices: verts, vertexCount: 0, indices: inds, indexCount: 0, uniforms: mat4AsBytes(&projection))
 
+ctx.viewportSize = UIVec2(1024, 720)
 
 let list = ctx.getDrawList()