diff --git a/ecoleA/change_username.sh b/ecoleA/change_username.sh
index 66a100a..bd48c18 100644
--- a/ecoleA/change_username.sh
+++ b/ecoleA/change_username.sh
@@ -1,4 +1,11 @@
 #!/bin/bash
+
+# Test du user ROOT
+if [ "$EUID" -ne 0 ]
+  then echo "Please run as root"
+  exit
+fi
+
 usermod -l aoste aosteadmin
 usermod -d /home/aoste -m aoste
 chfn -f aoste aoste