diff --git a/index.js b/index.js
index 78cafa8..389285f 100644
--- a/index.js
+++ b/index.js
@@ -89,7 +89,9 @@ module.exports = function (args, opts) {
 		for (var i = 0; i < keys.length - 1; i++) {
 			var key = keys[i];
 			if (isConstructorOrProto(o, key)) { return; }
-			if (o[key] === undefined) { o[key] = {}; }
+			if (o[key] === undefined) {
+				o[key] = (/^\d+$/).test(keys[i + 1]) ? [] : {};
+			}
 			if (
 				o[key] === Object.prototype
 				|| o[key] === Number.prototype
diff --git a/test/dotted.js b/test/dotted.js
index c606118..ac524c1 100644
--- a/test/dotted.js
+++ b/test/dotted.js
@@ -25,12 +25,8 @@ test('dotted default with no alias', function (t) {
 
 test('dotted array', function (t) {
 	var argv = parse(['--a.1.foo', '11']);
-
-	t.notOk(Array.isArray(argv.a));
-
-	t.notOk(0 in argv.a);
-
+	t.true(Array.isArray(argv.a));
+	t.false(0 in argv.a);
 	t.equal(argv.a[1].foo, 11);
-
 	t.end();
 });