diff --git a/bricks/input.js b/bricks/input.js
index baf4a2e..2c4eae5 100644
--- a/bricks/input.js
+++ b/bricks/input.js
@@ -497,7 +497,7 @@ bricks.UiImage =class extends bricks.VBox {
 				rate:2});
 		this.add_widget(this.camera_w);
 		this.camera_w.bind('click', this.take_photo.bind(this));
-		this.bind('dragover', {event) => {
+		this.bind('dragover', (event) => {
 			event.preventDefault();
 		});
 		this.bind('drop', this.dropHandle.bind(this));