diff --git a/sources/application/search/criterionconversion/criteriontooql.class.inc.php b/sources/application/search/criterionconversion/criteriontooql.class.inc.php
index b67171a4c..91a466ea4 100644
--- a/sources/application/search/criterionconversion/criteriontooql.class.inc.php
+++ b/sources/application/search/criterionconversion/criteriontooql.class.inc.php
@@ -200,7 +200,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 				$aRawValues[] = $sRawValue;
 			}
 		}
-		$sValue = implode(' ', $aRawValues);
+		$sValue = '"'.implode('" "', $aRawValues).'" _';
 
 		if (empty($sValue))
 		{