diff --git a/samples/map-drawing-terradraw/index.ts b/samples/map-drawing-terradraw/index.ts
index 4b4e3ef0a..5544f492a 100644
--- a/samples/map-drawing-terradraw/index.ts
+++ b/samples/map-drawing-terradraw/index.ts
@@ -169,7 +169,7 @@ async function init() {
             }
         });
 
-        map.addListener('projection_changed', () => {
+        google.maps.event.addListenerOnce(map, 'projection_changed', () => {
             // [START maps_drawing_terradraw_modes]
 
             draw = new TerraDraw({