diff --git a/user_reference/user_reference.module b/user_reference/user_reference.module
index e5749e5..8d5c2dc 100644
--- a/user_reference/user_reference.module
+++ b/user_reference/user_reference.module
@@ -441,7 +441,7 @@ function _user_reference_potential_references_standard($field, $string = '', $ma
   }
 
   $query = db_select('users', 'u');
-  $user_uid_alias    = $query->addField('u', 'uid');
+  $user_uid_alias    = $query->addField('u', 'uid', 'u_uid'); // Prevent "uid" ambiguity with users_roles
   $user_name_alias   = $query->addField('u', 'name');
   $user_status_alias = $query->addField('u', 'status');
   $query->addMetaData('id', ' _user_reference_potential_references_standard');
@@ -491,7 +491,7 @@ function _user_reference_potential_references_standard($field, $string = '', $ma
   $result = $query->execute();
   $references = array();
   foreach ($result->fetchAll() as $user) {
-    $references[$user->uid] = array(
+    $references[$user->u_uid] = array(
       'title'    => $user->name,
       'rendered' => check_plain($user->name),
     );