diff --git a/nixos/modules/services/networking/ntp/chrony.nix b/nixos/modules/services/networking/ntp/chrony.nix
index 42dbc5c5612..d568a7aed88 100644
--- a/nixos/modules/services/networking/ntp/chrony.nix
+++ b/nixos/modules/services/networking/ntp/chrony.nix
@@ -5,7 +5,7 @@ with lib;
 let
   cfg = config.services.chrony;
 
-  stateDir = "/var/lib/chrony";
+  stateDir = cfg.directory;
   driftFile = "${stateDir}/chrony.drift";
   keyFile = "${stateDir}/chrony.keys";
 
@@ -82,6 +82,12 @@ in
         '';
       };
 
+      directory = mkOption {
+        type = types.str;
+        default = "/var/lib/chrony";
+        description = "Directory where chrony state is stored.";
+      };
+
       extraConfig = mkOption {
         type = types.lines;
         default = "";