diff --git a/source/java/org/alfresco/rest/api/people/PeopleEntityResource.java b/source/java/org/alfresco/rest/api/people/PeopleEntityResource.java
index 8d2e5f34c7..be57730382 100644
--- a/source/java/org/alfresco/rest/api/people/PeopleEntityResource.java
+++ b/source/java/org/alfresco/rest/api/people/PeopleEntityResource.java
@@ -153,7 +153,8 @@ public class PeopleEntityResource implements EntityResourceAction.ReadById<Perso
 
         if (person.getUserName() != null)
         {
-            throw new InvalidArgumentException("Unsupported field: userName");
+            // REPO-1537
+            throw new InvalidArgumentException("Unsupported field: id");
         }
 
         if (person.getStatusUpdatedAt() != null)