diff --git a/makefu/3modules/snapraid.nix b/makefu/3modules/snapraid.nix
index 3d458bbbf..acdeb46d8 100644
--- a/makefu/3modules/snapraid.nix
+++ b/makefu/3modules/snapraid.nix
@@ -35,7 +35,7 @@ let
     enable = mkEnableOption "snapraid";
 
     timerConfig = mkOption {
-      type = types.unspecified;
+      type = with types;attrsOf str;
       description = ''
         Start snapraid service
       '';