diff --git a/hosts/skydick/default.nix b/hosts/skydick/default.nix
index d454df4..904700e 100644
--- a/hosts/skydick/default.nix
+++ b/hosts/skydick/default.nix
@@ -9,6 +9,12 @@
   networking.hostName = "skydick";
   networking.hostId = "8425e349";  # Required for ZFS
 
+  # Time sync: pin local CERNET NTP. The NixOS default pool resolved to an
+  # abroad Vultr server (0.nixos.pool.ntp.org, 137ms delay / 42ms jitter ->
+  # ~60ms offset that flapped the clock-drift alert). ntp.tuna.tsinghua.edu.cn
+  # is on-campus (sub-ms); ntp.ntsc.ac.cn (NTSC stratum-1, ~19ms) is the backup.
+  networking.timeServers = [ "ntp.tuna.tsinghua.edu.cn" "ntp.ntsc.ac.cn" ];
+
   # ==========================================================================
   # HARDWARE CONFIGURATION
   # ==========================================================================