diff --git a/host-registry.nix b/host-registry.nix
index fd62ff1a..7b5e1ff3 100644
--- a/host-registry.nix
+++ b/host-registry.nix
@@ -76,8 +76,6 @@ rec {
         "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMFbxHGfBMBjjior1FNRub56O62K++HVnqUH67BeKD7d";
     };
     matemat = {
-      ip4 = "172.22.99.133";
-      ip6 = "2a00:8180:2c00:223:f82b:1bff:fedc:8572";
       publicKey =
         "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBa07c4NnU1TGX1SMNea9e1d4nMtc0OS4gJLmTA3g/fe";
     };
diff --git a/hosts/containers/matemat/default.nix b/hosts/containers/matemat/default.nix
index 8b7d69a2..275a4c8c 100644
--- a/hosts/containers/matemat/default.nix
+++ b/hosts/containers/matemat/default.nix
@@ -1,14 +1,19 @@
-{ lib, pkgs, ... }:
+{ hostRegistry, lib, pkgs, ... }:
 {
   c3d2 = {
     isInHq = true;
     hq.interface = "eth0";
   };
-  networking = {
-    hostName = "matemat";
-    interfaces.eth0.useDHCP = lib.mkForce true;
-    firewall.allowedTCPPorts = [ 80 443 ];
+  networking.hostName = "matemat";
+  networking.useNetworkd = true;
+  networking.interfaces.eth0 = {
+    ipv4.addresses = [{
+      address = hostRegistry.hosts.matemat.ip4;
+      prefixLength = 26;
+    }];
   };
+  networking.defaultGateway = "172.20.73.1";
+  networking.firewall.allowedTCPPorts = [ 80 443 ];
 
   services.yammat.enable = true;