diff --git a/moulinette/actionsmap.py b/moulinette/actionsmap.py
index 7b7dc53f..40189335 100644
--- a/moulinette/actionsmap.py
+++ b/moulinette/actionsmap.py
@@ -90,7 +90,7 @@ class CommentParameter(_ExtraParameter):
     skipped_iface = ["api"]
 
     def __call__(self, message, arg_name, arg_value):
-        if arg_value:
+        if arg_value is None:
             return
         return msignals.display(m18n.n(message))