diff --git a/user/user.php b/user/user.php
index 68bc243..792d850 100644
--- a/user/user.php
+++ b/user/user.php
@@ -93,17 +93,14 @@ private function getAdministeredGroups() {
 			return \OC_SubAdmin::getSubAdminsGroups($this->getUserId());
 		}
 		// Nextcloud 9
-		$subadmin = new \OC\SubAdmin(
+		$groups = (new \OC\SubAdmin(
 			\OC::$server->getUserManager(),
 			\OC::$server->getGroupManager(),
 			\OC::$server->getDatabaseConnection()
-		);
-		$ocgroups = $subadmin->getSubAdminsGroups($this->user);
-		$groups = array();
-		foreach ($ocgroups as $ocgroup) {
-			$groups[] = $ocgroup->getGID();
-		}
-		return $groups;
+		))->getSubAdminsGroups($this->user);
+		return array_map(function ($group) {
+			return $group->getGID();
+		}, $groups);
 	}
 
 	private function isAdmin() {