diff --git a/index.js b/index.js
index 2fa5f67..fb64559 100644
--- a/index.js
+++ b/index.js
@@ -77,9 +77,8 @@ export default class Queue {
 	}
 
 	* drain() {
-		let current;
-		while ((current = this.dequeue()) !== undefined) {
-			yield current;
+		while (this.#head) {
+			yield this.dequeue();
 		}
 	}
 }
diff --git a/test.js b/test.js
index 57ac1f4..1ed25bf 100644
--- a/test.js
+++ b/test.js
@@ -73,8 +73,9 @@ test('iterable', t => {
 test('.drain()', t => {
 	const queue = new Queue();
 	queue.enqueue('🦄');
+	queue.enqueue(undefined);
 	queue.enqueue('🌈');
-	for (const _ of queue.drain()) {}
+	t.deepEqual([...queue.drain()], ['🦄', undefined, '🌈']);
 	t.deepEqual([...queue], []);
 	t.is(queue.size, 0);
 })