How to access sub objects in ng-repeat with ngRepeat

Considering this:

items = [
    { val: 'bleh1', subval: { attr1: 1, attr2: 2 } },
    { val: 'bleh2', subval: { attr1: 3, attr2: 4 } },
]

How can I print the attributes like 'item.subval.attr1' like this:

<div ng-repeat="item in items">
    <div>{{item.val}}</div>
    <div>{{item.subval.attr1}}</div>
    <div>{{item.subval.attr2}}</div>
</div>

The subval attributes don't print, instead I get this:

bleh1
{{item.subval.attr1}}
{{item.subval.attr2}}
bleh2
{{item.subval.attr1}}
{{item.subval.attr2}}

Thanks!