diff --git a/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php b/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php
index e8e436ba5bd2c..c37150746855f 100644
--- a/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php
+++ b/lib/private/DB/QueryBuilder/ExpressionBuilder/OCIExpressionBuilder.php
@@ -170,7 +170,7 @@ public function castColumn($column, $type) {
 			$column = $this->helper->quoteColumnName($column);
 			return new QueryFunction('to_char(' . $column . ')');
 		}
-		if ($type === IQueryBuilder::PARAM_INT) {
+		if ($type === IQueryBuilder::PARAM_INT || $type === IQueryBuilder::PARAM_BOOL) {
 			$column = $this->helper->quoteColumnName($column);
 			return new QueryFunction('to_number(to_char(' . $column . '))');
 		}