diff --git a/nixos/modules/services/system/cachix-agent/default.nix b/nixos/modules/services/system/cachix-agent/default.nix
index 64b31b3b01c6..5b529c1789e2 100644
--- a/nixos/modules/services/system/cachix-agent/default.nix
+++ b/nixos/modules/services/system/cachix-agent/default.nix
@@ -29,6 +29,12 @@ in {
       description = lib.mdDoc "Profile name, defaults to 'system' (NixOS).";
     };
 
+    host = mkOption {
+      type = types.str;
+      default = null;
+      description = lib.mdDoc "Cachix uri to use.";
+    };
+
     package = mkOption {
       type = types.package;
       default = pkgs.cachix;
@@ -63,7 +69,10 @@ in {
         KillMode = "process";
         Restart = "on-failure";
         EnvironmentFile = cfg.credentialsFile;
-        ExecStart = "${cfg.package}/bin/cachix ${lib.optionalString cfg.verbose "--verbose"} deploy agent ${cfg.name} ${if cfg.profile != null then cfg.profile else ""}";
+        ExecStart = ''
+          ${cfg.package}/bin/cachix ${lib.optionalString cfg.verbose "--verbose"} ${lib.optionalString (cfg.host != null) "--host ${cfg.host}"} \
+            deploy agent ${cfg.name} ${if cfg.profile != null then cfg.profile else ""}
+        '';
       };
     };
   };