diff --git a/scripts/install b/scripts/install
index 7704aef..25bf37a 100755
--- a/scripts/install
+++ b/scripts/install
@@ -86,6 +86,7 @@ ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 ynh_setup_source --dest_dir="$final_path"
 
 chmod 750 "$final_path"
+ynh_exec_warn_less mkdir sessions
 chmod -R o-rwx "$final_path"
 chown -R $app:www-data "$final_path"
 
diff --git a/scripts/upgrade b/scripts/upgrade
index adfeccf..39e2e16 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -86,6 +86,7 @@ popd
 ynh_setup_source --dest_dir="$final_path" --full_replace=1
 
 chmod 750 "$final_path"
+ynh_exec_warn_less mkdir sessions
 chmod -R o-rwx "$final_path"
 chown -R $app:www-data "$final_path"