diff --git a/system/database/DB_query_builder.php b/system/database/DB_query_builder.php
index 5ea9643..ed00510 100644
--- a/system/database/DB_query_builder.php
+++ b/system/database/DB_query_builder.php
@@ -2077,7 +2077,7 @@
 				for ($ci = 0, $cc = count($conditions); $ci < $cc; $ci++)
 				{
 					if (($op = $this->_get_operator($conditions[$ci])) === FALSE
-						OR ! preg_match('/^(\(?)(.*)('.preg_quote($op).')\s*(.*(?<!\)))?(\)?)$/i', $conditions[$ci], $matches))
+						OR ! preg_match('/^(\(?)(.*)('.preg_quote($op, '/').')\s*(.*(?<!\)))?(\)?)$/i', $conditions[$ci], $matches))
 					{
 						continue;
 					}