diff --git a/nixos/modules/services/misc/cgminer.nix b/nixos/modules/services/misc/cgminer.nix
index b80a4746fd1..662570f9451 100644
--- a/nixos/modules/services/misc/cgminer.nix
+++ b/nixos/modules/services/misc/cgminer.nix
@@ -41,12 +41,14 @@ in
       };
 
       user = mkOption {
+        type = types.str;
         default = "cgminer";
         description = "User account under which cgminer runs";
       };
 
       pools = mkOption {
         default = [];  # Run benchmark
+        type = types.listOf (types.attrsOf types.str);
         description = "List of pools where to mine";
         example = [{
           url = "http://p2pool.org:9332";
@@ -57,6 +59,7 @@ in
 
       hardware = mkOption {
         default = []; # Run without options
+        type = types.listOf (types.attrsOf (types.either types.str types.int));
         description= "List of config options for every GPU";
         example = [
         {
@@ -83,6 +86,7 @@ in
 
       config = mkOption {
         default = {};
+        type = (types.either types.bool types.int);
         description = "Additional config";
         example = {
           auto-fan = true;