1 files changed, 1 insertions, 1 deletions

diff --git a/nix/module.nix b/nix/module.nix
index 809b1df..1c94c8f 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -26,7 +26,7 @@ let
 
     serviceConfig = {
       ExecStart = let
-        sArgs = [ dCfg.path (toString dCfg.maxSize) ] + (optional (dCfg.monitorTimeout != null) dCfg.monitorTimeout);
+        sArgs = [ dCfg.path (toString dCfg.maxSize) ] + (optional (dCfg.monitorTimeout != null) (toString dCfg.monitorTimeout));
       in "${pkgs.rolling-directory}/bin/rolling-directory ${escapeShellArgs sArgs}";
     };
   };