diff --git a/sources/Application/Search/CriterionConversion/criteriontooql.class.inc.php b/sources/Application/Search/CriterionConversion/criteriontooql.class.inc.php
index a3f61b8f5..d44358bcd 100644
--- a/sources/Application/Search/CriterionConversion/criteriontooql.class.inc.php
+++ b/sources/Application/Search/CriterionConversion/criteriontooql.class.inc.php
@@ -119,7 +119,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 		$aValues = self::GetValues($aCriteria);
 		$sValue = self::GetValue($aValues, 0);
 
-		if (!Utils::StrLen($sValue)) {
+		if (!\Utils::StrLen($sValue)) {
 			return "1";
 		}
 
@@ -131,7 +131,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 		$aValues = self::GetValues($aCriteria);
 		$sValue = self::GetValue($aValues, 0);
 
-		if (!Utils::StrLen($sValue)) {
+		if (!\Utils::StrLen($sValue)) {
 			return "1";
 		}
 
@@ -143,7 +143,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 		$aValues = self::GetValues($aCriteria);
 		$sValue = self::GetValue($aValues, 0);
 
-		if (!Utils::StrLen($sValue)) {
+		if (!\Utils::StrLen($sValue)) {
 			return "1";
 		}
 
@@ -159,7 +159,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 			return "({$sRef} = '0')";
 		}
 
-		if (!Utils::StrLen($sValue) && (!(isset($aCriteria['has_undefined'])) || !($aCriteria['has_undefined']))) {
+		if (!\Utils::StrLen($sValue) && (!(isset($aCriteria['has_undefined'])) || !($aCriteria['has_undefined']))) {
 			return "1";
 		}
 
@@ -171,7 +171,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 		$aValues = self::GetValues($aCriteria);
 		$sValue = self::GetValue($aValues, 0);
 
-		if (!Utils::StrLen($sValue)) {
+		if (!\Utils::StrLen($sValue)) {
 			return "1";
 		}
 
@@ -186,7 +186,7 @@ class CriterionToOQL extends CriterionConversionAbstract
 		for($i = 0; $i < count($aValues); $i++)
 		{
 			$sRawValue = self::GetValue($aValues, $i);
-			if (!Utils::StrLen($sRawValue)) {
+			if (!\Utils::StrLen($sRawValue)) {
 				$bHasUnDefined = true;
 			} else {
 				$aRawValues[] = $sRawValue;