diff --git a/nixos/modules/services/misc/calibre-server.nix b/nixos/modules/services/misc/calibre-server.nix
index a920aa22ccdf..6b19f780ec0c 100644
--- a/nixos/modules/services/misc/calibre-server.nix
+++ b/nixos/modules/services/misc/calibre-server.nix
@@ -42,7 +42,7 @@ in
         serviceConfig = {
           User = "calibre-server";
           Restart = "always";
-          ExecStart = "${pkgs.calibre}/bin/calibre-server --with-library=${cfg.libraryDir}";
+          ExecStart = "${pkgs.calibre}/bin/calibre-server ${cfg.libraryDir}";
         };
 
       };