diff --git a/library/Class/MoteurRecherche.php b/library/Class/MoteurRecherche.php
index 603d397f7df40a7c3db2454c811056c5aca9d0ce..07a983d3f59511711dc324d35994cef889095f6d 100644
--- a/library/Class/MoteurRecherche.php
+++ b/library/Class/MoteurRecherche.php
@@ -132,7 +132,7 @@ class Class_MoteurRecherche {
   }
 
 
-  public function visitExpression($expression, $pertinence, $tri, $in_files) {
+  public function visitExpression($expression, $pertinence, $tri, $in_files=false) {
     // Analyse de l'expression
     $expression = trim($expression);
     if ($expression == '*')