diff --git a/tests.toml b/tests.toml
index 72f8b13..c2c8b31 100644
--- a/tests.toml
+++ b/tests.toml
@@ -10,7 +10,7 @@ test_format = 1.0
 
     preinstall = """
     sudo yunohost tools update
-    sudo yunohost app install zerotier
+    sudo yunohost app install zerotier -f
     """
 
     # -------------------------------