diff --git a/src/containers/sprite-selector-item.jsx b/src/containers/sprite-selector-item.jsx
index a9e538f30d4f11a3d134d3ef6348dc4ed9f2b554..c2620071585b882c1164284a306ff850bbd8ca8a 100644
--- a/src/containers/sprite-selector-item.jsx
+++ b/src/containers/sprite-selector-item.jsx
@@ -40,7 +40,7 @@ class SpriteSelectorItem extends React.Component {
 
 SpriteSelectorItem.propTypes = {
     costumeURL: React.PropTypes.string,
-    id: React.PropTypes.string,
+    id: React.PropTypes.oneOfType([React.PropTypes.string, React.PropTypes.number]),
     name: React.PropTypes.string,
     onClick: React.PropTypes.func,
     onDeleteButtonClick: React.PropTypes.func,