diff --git a/packages/react-devtools-shared/src/utils.js b/packages/react-devtools-shared/src/utils.js
index da605ba4e8b95..b71484cd244bb 100644
--- a/packages/react-devtools-shared/src/utils.js
+++ b/packages/react-devtools-shared/src/utils.js
@@ -948,7 +948,7 @@ export function formatDataForPreview(
     case 'date':
       return data.toString();
     case 'class_instance':
-      return data.constructor.name;
+      return Object.getPrototypeOf(data).constructor.name;
     case 'object':
       if (showFormattedValue) {
         const keys = Array.from(getAllEnumerableKeys(data)).sort(alphaSortKeys);