diff --git a/nixos/modules/system/boot/systemd/initrd.nix b/nixos/modules/system/boot/systemd/initrd.nix
index e843214f855..03f94c426cb 100644
--- a/nixos/modules/system/boot/systemd/initrd.nix
+++ b/nixos/modules/system/boot/systemd/initrd.nix
@@ -372,6 +372,8 @@ in {
         "/etc/os-release".source = config.boot.initrd.osRelease;
         "/etc/initrd-release".source = config.boot.initrd.osRelease;
 
+      } // optionalAttrs (config.environment.etc ? "modprobe.d/nixos.conf") {
+        "/etc/modprobe.d/nixos.conf".source = config.environment.etc."modprobe.d/nixos.conf".source;
       };
 
       storePaths = [