diff --git a/assets/js/tuto3-ai4t.js b/assets/js/tuto3-ai4t.js
index c65ff621dbc3791136bf8d0612cb92128f5d12a3..e267d3655bd7ae70568de80596e432b090f104c3 100644
--- a/assets/js/tuto3-ai4t.js
+++ b/assets/js/tuto3-ai4t.js
@@ -28,7 +28,7 @@
     // Lang : ecrit dans le index.php via PHP
     let lang = $application.attr('data-lang');
     // Lang file extension used for subtitles
-    let langExt = lang ? '':`-${lang}`;
+    let langExt = lang ? `-${lang}`:'';
     let videoExt = lang && lang === 'fr' ? '':`-en`;
 
     // Chemins