diff --git a/composer.json b/composer.json
index 86b5d2de13726844d46d4c77559a394e9e9df72d..5aab6c923b1bdbbab614dd86014133e471ba49f1 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
         "source": "https://gitlab.irstea.fr/pole-is/bundles/plantuml-bundle/tree/master"
     },
     "autoload": {
-        "psr-4": { "Irstea\\PlantUmlBundle\\": "src/" }
+        "psr-4": { "Irstea\\PlantUmlBundle\\": "src/" },
+        "files": ["src/functions.php"]
     },
     "minimum-stability": "stable",
     "autoload-dev": {
diff --git a/src/Finder/ClassFinder.php b/src/Finder/ClassFinder.php
index 11fc15557df1aadc1887536b1f3c14f334b9266e..9c5c3f88a8c0b9837f8d63377c809e479de96510 100644
--- a/src/Finder/ClassFinder.php
+++ b/src/Finder/ClassFinder.php
@@ -76,8 +76,3 @@ class ClassFinder implements FinderInterface
         $conf['directories'] = $this->directories;
     }
 }
-
-function irstea_plantmul_include($filepath)
-{
-    @include_once $filepath;
-}
diff --git a/src/functions.php b/src/functions.php
new file mode 100644
index 0000000000000000000000000000000000000000..d33e3c1a9c9bb06136aace87cf44bbf9bc9ebefa
--- /dev/null
+++ b/src/functions.php
@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+/*
+ * Copyright (C) 2016-2017 IRSTEA
+ * All rights reserved.
+ */
+
+/**
+ * @param string $filepath
+ */
+function irstea_plantmul_include($filepath)
+{
+    /* @noinspection UsingInclusionOnceReturnValueInspection */
+    @include_once $filepath;
+}