diff --git a/src/components/sprite-selector/sprite-selector.jsx b/src/components/sprite-selector/sprite-selector.jsx
index 906479d717f9ef2efeb386427f6810f727235499..fdec937a9fdd146e919ade7dc6d56319ac99567f 100644
--- a/src/components/sprite-selector/sprite-selector.jsx
+++ b/src/components/sprite-selector/sprite-selector.jsx
@@ -79,9 +79,9 @@ const SpriteSelectorComponent = function (props) {
                                 className={hoveredTarget.sprite === sprite.id &&
                                     sprite.id !== editingTarget &&
                                     hoveredTarget.receivedBlocks ?
-                                        classNames(styles.sprite, styles.receivedBlocks) :
-                                        raised && sprite.id !== editingTarget ?
-                                            classNames(styles.sprite, styles.raised) : styles.sprite}
+                                    classNames(styles.sprite, styles.receivedBlocks) :
+                                    raised && sprite.id !== editingTarget ?
+                                        classNames(styles.sprite, styles.raised) : styles.sprite}
                                 id={sprite.id}
                                 key={sprite.id}
                                 name={sprite.name}
diff --git a/src/containers/sprite-selector-item.jsx b/src/containers/sprite-selector-item.jsx
index 4b81507a0b656caf01301d443680cd0aea738803..d1a3e4b3fac0a29cc74fafbdd8d19dd799b2a534 100644
--- a/src/containers/sprite-selector-item.jsx
+++ b/src/containers/sprite-selector-item.jsx
@@ -73,7 +73,7 @@ SpriteSelectorItem.propTypes = {
     onClick: PropTypes.func,
     onDeleteButtonClick: PropTypes.func,
     onDuplicateButtonClick: PropTypes.func,
-    receivedBlocks: PropTypes.bool,
+    receivedBlocks: PropTypes.bool.isRequired,
     selected: PropTypes.bool
 };
 
diff --git a/test/unit/containers/sprite-selector-item.test.jsx b/test/unit/containers/sprite-selector-item.test.jsx
index 2a371a1a0dfe763c32737ee832a9a3009e57b0e7..a423fe81635a3685b6521a73f12824f3a5b380e0 100644
--- a/test/unit/containers/sprite-selector-item.test.jsx
+++ b/test/unit/containers/sprite-selector-item.test.jsx
@@ -12,6 +12,7 @@ describe('SpriteSelectorItem Container', () => {
     let costumeURL;
     let name;
     let onClick;
+    let dispatchSetHoveredSprite;
     let onDeleteButtonClick;
     let selected;
     let id;
@@ -23,6 +24,7 @@ describe('SpriteSelectorItem Container', () => {
                 <SpriteSelectorItem
                     className={className}
                     costumeURL={costumeURL}
+                    dispatchSetHoveredSprite={dispatchSetHoveredSprite}
                     id={id}
                     name={name}
                     selected={selected}
@@ -34,13 +36,14 @@ describe('SpriteSelectorItem Container', () => {
     };
 
     beforeEach(() => {
-        store = mockStore();
+        store = mockStore({hoveredTarget: {receivedBlocks: false, sprite: null}});
         className = 'ponies';
         costumeURL = 'https://scratch.mit.edu/foo/bar/pony';
         id = 1337;
         name = 'Pony sprite';
         onClick = jest.fn();
         onDeleteButtonClick = jest.fn();
+        dispatchSetHoveredSprite = jest.fn();
         selected = true;
         // Mock window.confirm() which is called when the close button is clicked.
         global.confirm = jest.fn(() => true);