diff --git a/nix/pkgs/tailscale/default.nix b/nix/pkgs/tailscale/default.nix
index c5ade28b19..0cee3e9e91 100644
--- a/nix/pkgs/tailscale/default.nix
+++ b/nix/pkgs/tailscale/default.nix
@@ -7,8 +7,8 @@ tailscale.overrideAttrs (old: {
     # Always use the polling monitor on routers.  The netlink-based monitor is
     # effectively just a wakeup-every-250ms system which causes ridiculously
     # high CPU.
-    rm wgengine/monitor/monitor_linux.go
-    substituteInPlace wgengine/monitor/monitor_polling.go \
+    rm net/netmon/netmon_linux.go
+    substituteInPlace net/netmon/netmon_polling.go \
       --replace \
         "//go:build (!linux && !freebsd && !windows && !darwin) || android" \
         ""