diff --git a/pkgs/liminix-tools/default.nix b/pkgs/liminix-tools/default.nix
index 3d5858c..5f5ddae 100644
--- a/pkgs/liminix-tools/default.nix
+++ b/pkgs/liminix-tools/default.nix
@@ -66,12 +66,14 @@ in {
     } // {
       inherit device;
     };
-    address = interface: { family, addr } @ args: oneshot {
-      dependencies = [ interface ];
-      name = "${interface.device}.addr.${addr}";
-      up = "ip address add ${addr} dev ${interface.device} ";
-      down = "ip address del ${addr} dev ${interface.device} ";
-    };
+    address = interface: { family, prefixLength, address } @ args:
+      let inherit (builtins) toString;
+      in oneshot {
+        dependencies = [ interface ];
+        name = "${interface.device}.addr.${address}";
+        up = "ip address add ${address}/${toString prefixLength} dev ${interface.device} ";
+        down = "ip address del ${address}/${toString prefixLength} dev ${interface.device} ";
+      };
     udhcpc = callPackage ./networking/udhcpc.nix {};
     odhcpc = interface: { ... } @ args: longrun {
       name = "${interface.device}.odhcp";
diff --git a/tests/pppoe/configuration.nix b/tests/pppoe/configuration.nix
index 75193ed..c002aca 100644
--- a/tests/pppoe/configuration.nix
+++ b/tests/pppoe/configuration.nix
@@ -8,8 +8,8 @@ in rec {
     in bundle {
       name = "loopback";
       contents = [
-        (address iface { family = "inet4"; addr ="127.0.0.1";})
-        (address iface { family = "inet6"; addr ="::1";})
+        (address iface { family = "inet4"; address ="127.0.0.1"; prefixLength = 8;})
+        (address iface { family = "inet6"; address ="::1"; prefixLength = 128;})
       ];
     };
 
diff --git a/tests/smoke/configuration.nix b/tests/smoke/configuration.nix
index e56d8ff..2696c8c 100644
--- a/tests/smoke/configuration.nix
+++ b/tests/smoke/configuration.nix
@@ -8,8 +8,8 @@ in rec {
     in bundle {
       name = "loopback";
       contents = [
-        (address iface { family = "inet4"; addr ="127.0.0.1";})
-        (address iface { family = "inet6"; addr ="::1";})
+        (address iface { family = "inet4"; address ="127.0.0.1"; prefixLength = 8;})
+        (address iface { family = "inet6"; address ="::1"; prefixLength = 128;})
       ];
     };
   services.dhcpv4 =