diff --git a/src/nixos.rs b/src/nixos.rs
index 3a05609..6e2f06f 100644
--- a/src/nixos.rs
+++ b/src/nixos.rs
@@ -207,7 +207,11 @@ pub fn get_final_attr(build_vm: bool, with_bootloader: bool) -> String {
     String::from(attr)
 }
 
-pub fn toplevel_for<S: AsRef<str>>(hostname: S, installable: Installable, final_attr: String) -> Installable {
+pub fn toplevel_for<S: AsRef<str>>(
+    hostname: S,
+    installable: Installable,
+    final_attr: String,
+) -> Installable {
     let mut res = installable.clone();
     let hostname = hostname.as_ref().to_owned();