diff --git a/modules/sys/time.nix b/modules/sys/time.nix
index 9ef7cd3..b14dcc5 100644
--- a/modules/sys/time.nix
+++ b/modules/sys/time.nix
@@ -1,3 +1,4 @@
+{lib, ...}:
 {
   # NTP configuration - NIST atomic clocks
   services.timesyncd = {
@@ -14,7 +15,7 @@
       "0.pool.ntp.org"
     ];
   };
-  time.timeZone = mkDefault "America/Denver";
+  time.timeZone = lib.mkDefault "America/Denver";
   i18n.defaultLocale = "en_US.UTF-8";
   i18n.extraLocaleSettings = {
     LC_ADDRESS = "en_US.UTF-8";