diff --git a/src/vs/base/common/async.ts b/src/vs/base/common/async.ts
index 3924e1fa8c15d54eacc3a79724bdec003a81087f..25ee4b83dac06a714b8fb0dc2570ef81177ac767 100644
--- a/src/vs/base/common/async.ts
+++ b/src/vs/base/common/async.ts
@@ -238,7 +238,7 @@ export class Delayer<T> {
 		}
 	}
 
-	async fire(): TPromise<void> {
+	fire(): void {
 		this.cancelTimeout();
 
 		if (this.completionPromise) {
diff --git a/src/vs/base/test/common/async.test.ts b/src/vs/base/test/common/async.test.ts
index 1040bb5f43b60d4723c443dc017aac540f656bf4..cfca78d7a3626bdf1e6f1e394aaad9953210b410 100644
--- a/src/vs/base/test/common/async.test.ts
+++ b/src/vs/base/test/common/async.test.ts
@@ -367,9 +367,8 @@ suite('Async', () => {
 
 		assert(delayer.isTriggered());
 
-		delayer.fire().then(() => {
-			assert(!delayer.isTriggered());
-		});
+		delayer.fire();
+		assert(!delayer.isTriggered());
 	});
 
 	test('Delayer - fire after finished', async function (this, done) {