diff --git a/packages/frontend/src/scripts/sound.ts b/packages/frontend/src/scripts/sound.ts
index 67818320b3..fcd59510df 100644
--- a/packages/frontend/src/scripts/sound.ts
+++ b/packages/frontend/src/scripts/sound.ts
@@ -126,7 +126,7 @@ export async function loadAudio(url: string, options?: { useCache?: boolean; })
  */
 export function playMisskeySfx(operationType: OperationType) {
 	const sound = defaultStore.state[`sound_${operationType}`];
-	if (sound.type == null || !canPlay || !navigator.userActivation.hasBeenActive) return;
+	if (sound.type == null || !canPlay || ('userActivation' in navigator && !navigator.userActivation.hasBeenActive)) return;
 
 	canPlay = false;
 	playMisskeySfxFile(sound).finally(() => {