diff --git a/src/permission/DefaultPermissions.php b/src/permission/DefaultPermissions.php
index 5fa38c9e9..f6de4ec07 100644
--- a/src/permission/DefaultPermissions.php
+++ b/src/permission/DefaultPermissions.php
@@ -28,7 +28,7 @@ abstract class DefaultPermissions{
 
 	public static function registerPermission(Permission $perm, ?Permission $parent = null) : Permission{
 		if($parent instanceof Permission){
-			$parent->getChildren()[$perm->getName()] = true;
+			$parent->addChild($perm->getName(), true);
 		}
 		PermissionManager::getInstance()->addPermission($perm);
 
diff --git a/src/permission/Permission.php b/src/permission/Permission.php
index 02066b26d..ad28f7d55 100644
--- a/src/permission/Permission.php
+++ b/src/permission/Permission.php
@@ -116,4 +116,9 @@ class Permission{
 			$p->recalculatePermissions();
 		}
 	}
+
+	public function addChild(string $name, bool $value) : void{
+		$this->children[$name] = $value;
+		$this->recalculatePermissibles();
+	}
 }