diff --git a/app/code/core/Mage/Rule/Model/Resource/Rule/Condition/SqlBuilder.php b/app/code/core/Mage/Rule/Model/Resource/Rule/Condition/SqlBuilder.php
index b48038d6cf7..0e3f249309f 100644
--- a/app/code/core/Mage/Rule/Model/Resource/Rule/Condition/SqlBuilder.php
+++ b/app/code/core/Mage/Rule/Model/Resource/Rule/Condition/SqlBuilder.php
@@ -91,7 +91,7 @@ public function getOperatorCondition($field, $operator, $value)
             foreach ($value as $v) {
                 $results[] = $this->_adapter->quoteInto("{$selectOperator}", $v);
             }
-            $result = implode(in_array($operator, ['()', '!()']) ? ' OR ' : ' AND ', $results);
+            $result = implode($operator == '()' ? ' OR ' : ' AND ', $results);
         } else {
             $result = $this->_adapter->quoteInto("{$field}{$selectOperator}", $value);
         }