diff --git a/examples/imgui_backend_sea.py b/examples/imgui_backend_sea.py
index 5b320c35..34c2ac39 100644
--- a/examples/imgui_backend_sea.py
+++ b/examples/imgui_backend_sea.py
@@ -402,8 +402,9 @@ def render():
     render_pass.draw(3, 1)
 
     # draw imgui
+    psize = canvas.get_physical_size()
     imgui_data = gui(app_state)
-    imgui_backend.render(imgui_data, render_pass)
+    imgui_backend.render(imgui_data, render_pass, psize)
 
     render_pass.end()
 
diff --git a/wgpu/utils/imgui/imgui_backend.py b/wgpu/utils/imgui/imgui_backend.py
index f45dbac8..24508a8f 100644
--- a/wgpu/utils/imgui/imgui_backend.py
+++ b/wgpu/utils/imgui/imgui_backend.py
@@ -390,6 +390,8 @@ def render(
             The draw data to render, this is usually obtained by calling ``imgui.get_draw_data()``
         render_pass : wgpu.GPURenderPassEncoder
             The render pass to render the imgui draw data with
+        psize : tuple(int, int)
+            The physical size of the canvas, get from calling ``canvas.get_physical_size()``
         """
         if draw_data is None:
             return