diff --git a/nixos/modules/services/networking/nsd.nix b/nixos/modules/services/networking/nsd.nix
index 2ac0a8c7922..4c6f54bd0fa 100644
--- a/nixos/modules/services/networking/nsd.nix
+++ b/nixos/modules/services/networking/nsd.nix
@@ -6,7 +6,7 @@ let
   cfg = config.services.nsd;
 
   username = "nsd";
-  stateDir = "/var/lib/nsd";
+  stateDir = cfg.stateDir;
   pidFile = stateDir + "/var/nsd.pid";
 
   # build nsd with the options needed for the given config
@@ -411,6 +411,14 @@ let
         '';
       };
 
+      stateDir = mkOption {
+        type = types.str;
+        default = "/var/lib/nsd";
+        description = ''
+          Directory at which to store NSD state.
+        '';
+      };
+
       zoneStats = mkOption {
         type = types.nullOr types.str;
         default = null;