diff --git a/lib/Froxlor/Domain/Domain.php b/lib/Froxlor/Domain/Domain.php
index 82616d37e3..d919f8d568 100644
--- a/lib/Froxlor/Domain/Domain.php
+++ b/lib/Froxlor/Domain/Domain.php
@@ -256,7 +256,7 @@ public static function getMainSubdomainIds(int $id): array
 		]);
 		$result = [];
 		while ($entry = $result_stmt->fetch(PDO::FETCH_ASSOC)) {
-			$result = $entry['id'];
+			$result[] = $entry['id'];
 		}
 		return $result;
 	}