diff --git a/core/oql/expression.class.inc.php b/core/oql/expression.class.inc.php
index 7f2d032a81..d0b4bf5050 100644
--- a/core/oql/expression.class.inc.php
+++ b/core/oql/expression.class.inc.php
@@ -1286,7 +1286,7 @@ class VariableExpression extends UnaryExpression
 			$res = CMDBSource::Quote($aArgs[$this->m_sName]);
 			if (is_array($res))
 			{
-				$res = implode(', ', $res);
+				$res = '('.implode(', ', $res).')';
 			}
 			return $res;
 		}