diff --git a/question/type/questiontypebase.php b/question/type/questiontypebase.php
index 3b02bb59357..6a4f773f80a 100644
--- a/question/type/questiontypebase.php
+++ b/question/type/questiontypebase.php
@@ -586,7 +586,7 @@ class question_type {
     }
 
     /**
-     * Returns true if extra answer fields for answer with the $key is empty 
+     * Returns true if extra answer fields for answer with the $key is empty
      * in the question data and should not be saved in DB.
      *
      * Questions where extra answer fields are optional will want to overload this.