diff --git a/system/nixos/chrony.nix b/system/nixos/chrony.nix
index 37cd3c1..b6d1c14 100644
--- a/system/nixos/chrony.nix
+++ b/system/nixos/chrony.nix
@@ -8,9 +8,9 @@
       "ptbtime1.ptb.de"
       "ptbtime2.ptb.de"
       "ptbtime3.ptb.de"
-      "ntp1.rwth-aachen.de"
-      "ntp2.rwth-aachen.de"
-      "ntp3.rwth-aachen.de"
+      "134.130.4.17" # "ntp1.rwth-aachen.de"
+      "134.130.5.17" # "ntp2.rwth-aachen.de"
+      "137.226.119.25" # "ntp3.rwth-aachen.de"
       "ntp1.hetzner.de"
       "ntp2.hetzner.de"
       "ntp3.hetzner.de"
@@ -18,6 +18,7 @@
     ];
 
     extraConfig = ''
+      burst 3/3
       makestep 1.0 3
 
       bindaddress 0.0.0.0