diff --git a/tuto2.yml b/tuto2.yml
index 29d5d3e..29b5b35 100644
--- a/tuto2.yml
+++ b/tuto2.yml
@@ -159,7 +159,7 @@ files:
 
       # Retrieve ssh keys
       mkdir -p root/.ssh/
-      [ -f root/.ssh/authorized_keys ] || /usr/sbin/chroot . /usr/bin/curl -s -f https://cri.epita.fr/$(sed 's/^.*MyLogin=//p;d' etc/wireguard/adlin.conf).keys > root/.ssh/authorized_keys
+      [ -s root/.ssh/authorized_keys ] || /usr/sbin/chroot . /usr/bin/curl -s -f https://cri.epita.fr/$(sed 's/^.*MyLogin=//p;d' etc/wireguard/adlin.conf).keys > root/.ssh/authorized_keys
       [ -f etc/ssh/ssh_host_rsa_key ] || /usr/sbin/chroot . ssh-keygen -A
 
       # To the user
diff --git a/tuto3.yml b/tuto3.yml
index 198dc89..8c90bd1 100644
--- a/tuto3.yml
+++ b/tuto3.yml
@@ -653,7 +653,7 @@ files:
     contents: |
       #!/bin/sh
       # Retrieve ssh keys
-      [ -f /var/lib/adlin/authorized_keys ] || nsenter -n/run/netns/router -- /usr/bin/wget -O /var/lib/adlin/authorized_keys https://cri.epita.fr/$(sed 's/^.*MyLogin=//p;d' /var/lib/adlin/wireguard/adlin.conf).keys
+      [ -s /var/lib/adlin/authorized_keys ] || nsenter -n/run/netns/router -- /usr/bin/wget -O /var/lib/adlin/authorized_keys https://cri.epita.fr/$(sed 's/^.*MyLogin=//p;d' /var/lib/adlin/wireguard/adlin.conf).keys
     mode: "0755"
 
 #  - path: etc/init.d/021-correction