diff --git a/src/components/target-pane/target-pane.jsx b/src/components/target-pane/target-pane.jsx
index bffb876e888..8d9a09929a7 100644
--- a/src/components/target-pane/target-pane.jsx
+++ b/src/components/target-pane/target-pane.jsx
@@ -104,6 +104,8 @@ const TargetPane = ({
 
 const spriteShape = PropTypes.shape({
     costume: PropTypes.shape({
+        // asset is defined in scratch-storage's Asset.js
+        asset: PropTypes.object, // eslint-disable-line react/forbid-prop-types
         url: PropTypes.string,
         name: PropTypes.string.isRequired,
         // The following are optional because costumes uploaded from disk
@@ -112,6 +114,7 @@ const spriteShape = PropTypes.shape({
         rotationCenterX: PropTypes.number,
         rotationCenterY: PropTypes.number
     }),
+    costumeCount: PropTypes.number,
     direction: PropTypes.number,
     id: PropTypes.string,
     name: PropTypes.string,
diff --git a/src/containers/monitor.jsx b/src/containers/monitor.jsx
index 18a6bbeab2d..5f20d69e0ce 100644
--- a/src/containers/monitor.jsx
+++ b/src/containers/monitor.jsx
@@ -232,8 +232,8 @@ Monitor.propTypes = {
     min: PropTypes.number,
     mode: PropTypes.oneOf(['default', 'slider', 'large', 'list']),
     monitorLayout: PropTypes.shape({
-        monitors: PropTypes.object,
-        savedMonitorPositions: PropTypes.object
+        monitors: PropTypes.object, // eslint-disable-line react/forbid-prop-types
+        savedMonitorPositions: PropTypes.object // eslint-disable-line react/forbid-prop-types
     }).isRequired,
     onDragEnd: PropTypes.func.isRequired,
     opcode: PropTypes.string.isRequired, // eslint-disable-line react/no-unused-prop-types