diff --git a/user/profile/lib.php b/user/profile/lib.php
index 081b086b274..ffea60509a0 100644
--- a/user/profile/lib.php
+++ b/user/profile/lib.php
@@ -263,7 +263,7 @@ class profile_field_base {
      * @return   boolean
      */
     function is_unique() {
-        return (boolean)$tihs->field->forceunique;
+        return (boolean)$this->field->forceunique;
     }
 
     /**