diff --git a/src/components/LastUpdatedCell/LastUpdatedCell.js b/src/components/LastUpdatedCell/LastUpdatedCell.js
index 6fbbc81..735461a 100644
--- a/src/components/LastUpdatedCell/LastUpdatedCell.js
+++ b/src/components/LastUpdatedCell/LastUpdatedCell.js
@@ -59,12 +59,11 @@ export default function LastUpdatedCell({ time, ItemTableCellProps }) {
 
 LastUpdatedCell.propTypes = {
     /** ISO 8601 formatted time string. */
-    "time": PropTypes.string,
+    "time": PropTypes.string.isRequired,
     /** Props to be applied to the ItemTableCell. */
     "ItemTableCellProps": PropTypes.object,
 };
 
 LastUpdatedCell.defaultProps = {
-    "time": "",
     "ItemTableCellProps": {},
 };
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