diff --git a/src/client/webapp/util.ts b/src/client/webapp/util.ts
index bb99960..083a36a 100644
--- a/src/client/webapp/util.ts
+++ b/src/client/webapp/util.ts
@@ -91,8 +91,8 @@ export default class Util {
 	}
 
 	/** waits a number of MS before continuing */
-	static async sleep(ms: number): Promise<unknown> {
-		return await new Promise(resolve => {
+	static async sleep(ms: number): Promise<void> {
+		await new Promise(resolve => {
 			setTimeout(resolve, ms);
 		});
 	}