diff --git a/scripts/backup b/scripts/backup
index 9c44d67..72490e6 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,5 +1,5 @@
 #!/bin/bash
-
+set -eu
 app=$YNH_APP_INSTANCE_NAME
 
 # Source YunoHost helpers
diff --git a/scripts/remove b/scripts/remove
index cb37f17..c4ffe87 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,5 +1,5 @@
 #!/bin/bash
-#set -eu
+set -u
 
 # Charge les fonctions génériques habituellement utilisées dans le script
 SECURE_REMOVE () {      # Suppression de dossier avec vérification des variables
diff --git a/scripts/restore b/scripts/restore
index 7306531..7be3da5 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,5 +1,5 @@
 #!/bin/bash
-
+set -eu
 app=$YNH_APP_INSTANCE_NAME
 
 # Source YunoHost helpers
diff --git a/scripts/upgrade b/scripts/upgrade
index 55cfcb6..594bfc3 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,4 +1,5 @@
 #!/bin/bash
+set -eu
 
 # We retrieve app parameters
 app=$YNH_APP_INSTANCE_NAME