diff --git a/tools/eslint-rules/documented-errors.js b/tools/eslint-rules/documented-errors.js
index f5f41dd8cc0417..a46fb885bb03b3 100644
--- a/tools/eslint-rules/documented-errors.js
+++ b/tools/eslint-rules/documented-errors.js
@@ -36,7 +36,7 @@ function getErrorsInDoc() {
 
     // If the code already exists in the Map, merge the new error data
     errors.set(code, {
-      ...(errors.get(code) || {}),
+      ...errors.get(code),
       ...error,
     });
   }