diff --git a/source/index.ts b/source/index.ts
index 3e72b71..868ec18 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -136,7 +136,7 @@ namespace is { // tslint:disable-line:no-namespace
 	export const nullOrUndefined = (value: any): value is null | undefined => null_(value) || undefined(value);
 	export const object = (value: any): value is object => !nullOrUndefined(value) && (function_(value) || isObject(value));
 	export const iterable = (value: any): value is IterableIterator<any> => !nullOrUndefined(value) && function_(value[Symbol.iterator]);
-	export const asyncIterable = (value: any): value is AsyncIterableIterator<any> => !nullOrUndefined(Symbol.asyncIterator) && function_(value[Symbol.asyncIterator]);
+	export const asyncIterable = (value: any): value is AsyncIterableIterator<any> => !nullOrUndefined(value) && function_(value[Symbol.asyncIterator]);
 	export const generator = (value: any): value is Generator => iterable(value) && function_(value.next) && function_(value.throw);
 
 	export const nativePromise = (value: any): value is Promise<any> =>
diff --git a/source/tests/test.ts b/source/tests/test.ts
index 9ccea39..a2d56ad 100644
--- a/source/tests/test.ts
+++ b/source/tests/test.ts
@@ -455,14 +455,6 @@ if (isNode8orHigher) {
 	});*/
 }
 
-if (isNode10orHigher) {
-	test('is.asyncIterable', t => {
-		t.true(m.asyncIterable(Object.create({
-			[Symbol.asyncIterator]: () => {} // tslint:disable-line:no-empty
-		})));
-	});
-}
-
 test('is.generator', t => {
 	testType(t, 'generator');
 });
@@ -612,6 +604,21 @@ test('is.iterable', t => {
 	t.false(m.iterable({}));
 });
 
+if (isNode10orHigher) {
+	test('is.asyncIterable', t => {
+		t.true(m.asyncIterable({
+			[Symbol.asyncIterator]: () => {} // tslint:disable-line:no-empty
+		}));
+
+		t.false(m.asyncIterable(null));
+		t.false(m.asyncIterable(undefined));
+		t.false(m.asyncIterable(0));
+		t.false(m.asyncIterable(NaN));
+		t.false(m.asyncIterable(Infinity));
+		t.false(m.asyncIterable({}));
+	});
+}
+
 test('is.class', t => {
 	class Foo {} // tslint:disable-line
 	const classDeclarations = [