diff --git a/tests.toml b/tests.toml
index 70ff51b..4ef117b 100644
--- a/tests.toml
+++ b/tests.toml
@@ -4,7 +4,7 @@ test_format = 1.0
 
 [default]
 
-    preinstall = """"
+    preinstall = """
     if cat /etc/os-release | grep --quiet bookworm 2>/dev/null; then
         yunohost app install --force https://github.com/yunoHost-Apps/metronome_ynh -a 'domain=domain.tld&init_main_permission=visitors'
     fi