diff --git a/Controller/ProfilerController.php b/Controller/ProfilerController.php
index 6b22c3dbf..6691db2b3 100644
--- a/Controller/ProfilerController.php
+++ b/Controller/ProfilerController.php
@@ -136,8 +136,10 @@ private function explainOtherPlatform(Connection $connection, string $query): ar
 
     /**
      * @param mixed[] $query
+     *
+     * @return mixed[]
      */
-    private function explainOraclePlatform(Connection $connection, array $query)
+    private function explainOraclePlatform(Connection $connection, array $query): array
     {
         $connection->executeQuery('EXPLAIN PLAN FOR ' . $query['sql']);