diff --git a/modules/config/networking.nix b/modules/config/networking.nix
index 18e0b834c98..591c758b299 100644
--- a/modules/config/networking.nix
+++ b/modules/config/networking.nix
@@ -64,7 +64,8 @@ in
             # a collision with an apparently unrelated environment
             # variable with the same name exported by dhcpcd.
             interface_order='lo lo[0-9]*'
-
+          '' + optionalString config.services.nscd.enable
+          ''
             # Invalidate the nscd cache whenever resolv.conf is
             # regenerated.
             libc_restart='${pkgs.upstart}/sbin/start invalidate-nscd'