diff --git a/www/js/backend.js b/www/js/backend.js
index bd29de8..b011f81 100644
--- a/www/js/backend.js
+++ b/www/js/backend.js
@@ -227,7 +227,8 @@ function update() {
         }
         Block.Time -= (Date.now() - Block.last_time)
         Block.last_time = Date.now()
-        if (Block.Time <= 0){
+        if (Block.Time <= 0){// si le block est fini
+            trais = !trais; //empecher l'inversion du trais
             load_cube_scene()
         }