diff --git a/modules/home-manager/files/mutable-files.nix b/modules/home-manager/files/mutable-files.nix
index f4a1f5fa..2d189eca 100644
--- a/modules/home-manager/files/mutable-files.nix
+++ b/modules/home-manager/files/mutable-files.nix
@@ -101,7 +101,7 @@ let
       };
 
       postScript = lib.mkOption {
-        type = lib.types.str;
+        type = lib.types.lines;
         description = ''
           A shell script fragment to be executed after the download.
         '';