diff --git a/manifests/params.pp b/manifests/params.pp
index c7b09f4..f7e32f2 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -27,7 +27,7 @@ $ay_service         = 'alloy'
 $ay_main_dir        = '/etc/alloy'
 
 # files
-$ay_main_file       = "$(ay_main_dir)/config.alloy"
+$ay_main_file       = "${ay_main_dir}/config.alloy"
 
 
   # includes must be last