diff --git a/src/Xinax/LaravelGettext/FileLoader/Cache/ApcuFileCacheLoader.php b/src/Xinax/LaravelGettext/FileLoader/Cache/ApcuFileCacheLoader.php
index 47d753f..d932b83 100644
--- a/src/Xinax/LaravelGettext/FileLoader/Cache/ApcuFileCacheLoader.php
+++ b/src/Xinax/LaravelGettext/FileLoader/Cache/ApcuFileCacheLoader.php
@@ -37,7 +37,7 @@ public function __construct(FileLoader $underlyingFileLoader)
      *
      * @throws InvalidResourceException if stream content has an invalid format
      */
-    protected function loadResource(string $resource)
+    protected function loadResource(string $resource): array
     {
         if (!extension_loaded('apcu')) {
             return $this->underlyingFileLoader->loadResource($resource);