diff --git a/apps/sandbox/src/main.rs b/apps/sandbox/src/main.rs
index add37fd..8593ebd 100644
--- a/apps/sandbox/src/main.rs
+++ b/apps/sandbox/src/main.rs
@@ -118,7 +118,7 @@ impl PanelWindow {
                 self.current_size = size;
 
                 let size = canary::Vec2::new(size.x, size.y);
-                self.panel.on_resize(size / PX_PER_MM);
+                self.panel.on_resize(size * PX_PER_MM);
             }
 
             if let Some(hover_pos) = response.hover_pos() {