diff --git a/crates/egui/src/viewport.rs b/crates/egui/src/viewport.rs
index 72bc23feb20..6aeb21288b3 100644
--- a/crates/egui/src/viewport.rs
+++ b/crates/egui/src/viewport.rs
@@ -1145,7 +1145,7 @@ impl ViewportOutput {
         let Self {
             parent,
             class,
-            builder,
+            builder: _,
             viewport_ui_cb,
             mut commands,
             repaint_delay,