diff --git a/default.nix b/default.nix
index 81752db..2b7e29c 100644
--- a/default.nix
+++ b/default.nix
@@ -1,9 +1,17 @@
-{ buildGoModule, ... }:
+{ lib, buildGoModule }:
 buildGoModule {
   pname = "ipwatch";
   version = "0.2.3";
-  src = ./.;
-  vendorHash = "sha256-VG1ZVwO78KUqyQpQw8hbjJm6AxvudoiNQbjYevd+qj8=";
+  src = lib.fileset.toSource {
+    root = ./.;
+    fileset = lib.fileset.unions [
+      ./go.mod
+      ./go.sum
+      ./cmd
+      ./ipwatch
+    ];
+  };
+  vendorHash = "sha256-SG/XqEXKTqmWbfe4H9+yVDp4YKicm2fP+tVV5bCtIpk=";
   ldflags = [
     "-s"
     "-w"
diff --git a/go.mod b/go.mod
index bdf9dc2..aa5b163 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.21
 toolchain go1.21.3
 
 require (
+	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
 	github.com/mdlayher/netlink v1.7.2
 	golang.org/x/sys v0.26.0
 )
diff --git a/go.sum b/go.sum
index 87d8993..e825d81 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
+github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf h1:iW4rZ826su+pqaw19uhpSCzhj44qo35pNgKFGqzDKkU=
+github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
diff --git a/ipwatch/ipwatch.go b/ipwatch/ipwatch.go
index cb0aefe..e5f7a79 100644
--- a/ipwatch/ipwatch.go
+++ b/ipwatch/ipwatch.go
@@ -15,6 +15,7 @@ import (
 	"time"
 	"unsafe"
 
+	systemdDaemon "github.com/coreos/go-systemd/daemon"
 	"github.com/mdlayher/netlink"
 	"golang.org/x/sys/unix"
 )
@@ -456,6 +457,8 @@ func (w *Watcher) Watch(cfg WatchConfig) error {
 		)
 	}
 
+	systemdDaemon.SdNotify(false, systemdDaemon.SdNotifyReady)
+
 	w.log.Println("Opening netlink socket")
 	conn, err := netlink.Dial(unix.NETLINK_ROUTE, &netlink.Config{
 		Groups: unix.RTMGRP_IPV4_IFADDR | unix.RTMGRP_IPV6_IFADDR,