diff --git a/nixos/modules/services/misc/cgminer.nix b/nixos/modules/services/misc/cgminer.nix
index 81eb42cbc5de..a6fbfee73bad 100644
--- a/nixos/modules/services/misc/cgminer.nix
+++ b/nixos/modules/services/misc/cgminer.nix
@@ -11,7 +11,7 @@ let
     mapAttrsToList (n: v: ''"${n}": "${(concatStringsSep "," (map convType v))}"'')
       (foldAttrs (n: a: [n] ++ a) [] cfg.hardware);
   mergedConfig = with builtins;
-    mapAttrsToList (n: v: ''"${n}":  ${if isBool v then (convType v) else ''"${convType v}"''}'')
+    mapAttrsToList (n: v: ''"${n}":  ${if isBool v then convType v else ''"${convType v}"''}'')
       cfg.config;
 
   cgminerConfig = pkgs.writeText "cgminer.conf" ''