diff --git a/lib/classes/Virusscanner.php b/lib/classes/Virusscanner.php
index 91786a64890de80941a20604026662f87e0adb47..628fdbac42d6414593df5512ad48a025cae5c485 100644
--- a/lib/classes/Virusscanner.php
+++ b/lib/classes/Virusscanner.php
@@ -27,7 +27,7 @@ class Virusscanner
      * @param string $path
      * @return array Contains the found virus signature, error message or is an empty array on successful scan
      */
-    public static function scan(string $path)
+    public static function scan(string $path): array
     {
         // Get virus scanner singleton.
         if (is_null(static::$instance)) {
@@ -85,6 +85,7 @@ class Virusscanner
             ];
         }
 
+        return [];
     }
 
     /**