diff --git a/src/database/src/AbstractConnection.php b/src/database/src/AbstractConnection.php
index bedb2c94..19cdaf30 100644
--- a/src/database/src/AbstractConnection.php
+++ b/src/database/src/AbstractConnection.php
@@ -453,7 +453,7 @@ public function statement(): \PDOStatement
      * @param int $fetchStyle
      * @return array|object|false
      */
-    public function queryOne(int $fetchStyle = null)
+    public function queryOne(?int $fetchStyle = null)
     {
         $fetchStyle = $fetchStyle ?: $this->options[\PDO::ATTR_DEFAULT_FETCH_MODE];
         return $this->statement->fetch($fetchStyle);
@@ -464,7 +464,7 @@ public function queryOne(int $fetchStyle = null)
      * @param int $fetchStyle
      * @return array
      */
-    public function queryAll(int $fetchStyle = null): array
+    public function queryAll(?int $fetchStyle = null): array
     {
         $fetchStyle = $fetchStyle ?: $this->options[\PDO::ATTR_DEFAULT_FETCH_MODE];
         return $this->statement->fetchAll($fetchStyle);
diff --git a/src/database/src/Connection.php b/src/database/src/Connection.php
index 977c75a5..59c7d891 100644
--- a/src/database/src/Connection.php
+++ b/src/database/src/Connection.php
@@ -11,12 +11,12 @@ class Connection extends AbstractConnection
 
     protected $exceptional = false;
 
-    public function queryOne(int $fetchStyle = null)
+    public function queryOne(?int $fetchStyle = null)
     {
         return $this->call(__FUNCTION__, func_get_args());
     }
 
-    public function queryAll(int $fetchStyle = null): array
+    public function queryAll(?int $fetchStyle = null): array
     {
         return $this->call(__FUNCTION__, func_get_args());
     }