diff --git a/nixos/modules/system/boot/systemd/initrd.nix b/nixos/modules/system/boot/systemd/initrd.nix
index 2ccc964820fe..eb3b78a14397 100644
--- a/nixos/modules/system/boot/systemd/initrd.nix
+++ b/nixos/modules/system/boot/systemd/initrd.nix
@@ -448,7 +448,10 @@ in {
 
         "/etc/sysctl.d/nixos.conf".text = "kernel.modprobe = /sbin/modprobe";
         "/etc/modprobe.d/systemd.conf".source = "${cfg.package}/lib/modprobe.d/systemd.conf";
-        "/etc/modprobe.d/ubuntu.conf".source = pkgs.runCommand "initrd-kmod-blacklist-ubuntu" { } ''
+        "/etc/modprobe.d/ubuntu.conf".source = pkgs.runCommand "initrd-kmod-blacklist-ubuntu" {
+            src = "${pkgs.kmod-blacklist-ubuntu}/modprobe.conf";
+            preferLocalBuild = true;
+        } ''
           ${pkgs.buildPackages.perl}/bin/perl -0pe 's/## file: iwlwifi.conf(.+?)##/##/s;' $src > $out
         '';
         "/etc/modprobe.d/debian.conf".source = pkgs.kmod-debian-aliases;