diff --git a/crates/bevy_animation/src/lib.rs b/crates/bevy_animation/src/lib.rs
index 56c623ff86..9fe1d89f25 100644
--- a/crates/bevy_animation/src/lib.rs
+++ b/crates/bevy_animation/src/lib.rs
@@ -300,6 +300,7 @@ impl AnimationEvent {
 }
 
 #[derive(Reflect, Clone)]
+#[reflect(opaque)]
 struct AnimationEventFn(Arc<dyn Fn(&mut Commands, Entity, f32, f32) + Send + Sync>);
 
 impl Default for AnimationEventFn {