diff --git a/start b/start
index 74d2a8af1f78f77b25d8a89ae836f7c1a2eaf357..c0d2ecc4e5ec888cb9532a03747decade2c09ca7 100644
--- a/start
+++ b/start
@@ -1,5 +1,6 @@
 #!/bin/bash
 git clone --single-branch -b master https://gitlab.irit.fr/toc/mathn7/etudiants/controle-optimal.git
+rm -fr tp
 mkdir tp
 mv controle-optimal/*.ipynb ./tp
 rm -rf controle-optimal