diff -u b/plugins/context/omniture_reaction_variables.inc b/plugins/context/omniture_reaction_variables.inc
--- b/plugins/context/omniture_reaction_variables.inc
+++ b/plugins/context/omniture_reaction_variables.inc
@@ -36,18 +36,19 @@
   /**
    * Implements context_reaction::execute()
    *
-   * Return a list of variables based on the current context. Note that tokens
+   * Updates the $variables array based on the current context. Note that tokens
    * will be replaced later in _omniture_format_variables().
+   *
+   * @param array $variables
+   *   The variables array, passed by reference. Context defined variables will
+   *   be added as new keys in this array.
    */
   function execute(&$variables) {
-    $settings = array();
-
     foreach ($this->get_contexts() as $context) {
       foreach ($context->reactions['omniture_vars']['omniture_variables'] as $key => $value) {
         $variables[$value['name']] = $value['value'];
       }
     }
-    return $variables;
   }
 }