diff --git a/nixos/modules/system/boot/stage-1.nix b/nixos/modules/system/boot/stage-1.nix
index 16bebe03740a..2c3dfd2f460f 100644
--- a/nixos/modules/system/boot/stage-1.nix
+++ b/nixos/modules/system/boot/stage-1.nix
@@ -205,7 +205,7 @@ let
   # The closure of the init script of boot stage 1 is what we put in
   # the initial RAM disk.
   initialRamdisk = pkgs.makeInitrd {
-    inherit (config.boot.initrd) compressor;
+    inherit (config.boot.initrd) compressor prepend;
 
     contents =
       [ { object = bootStage1;
@@ -247,6 +247,14 @@ in
       '';
     };
 
+    boot.initrd.prepend = mkOption {
+      default = [ ];
+      type = types.listOf types.str;
+      description = ''
+        Other initrd files to prepend to the final initrd we are building.
+      '';
+    };
+
     boot.initrd.checkJournalingFS = mkOption {
       default = true;
       type = types.bool;
diff --git a/pkgs/build-support/kernel/make-initrd.nix b/pkgs/build-support/kernel/make-initrd.nix
index 0582ca553012..895160616b79 100644
--- a/pkgs/build-support/kernel/make-initrd.nix
+++ b/pkgs/build-support/kernel/make-initrd.nix
@@ -12,7 +12,7 @@
 # `contents = {object = ...; symlink = /init;}' is a typical
 # argument.
 
-{stdenv, perl, perlArchiveCpio, cpio, contents, ubootChooser, compressor}:
+{ stdenv, perl, perlArchiveCpio, cpio, contents, ubootChooser, compressor, prepend }:
 
 let
   inputsFun = ubootName : [perl cpio perlArchiveCpio ]
@@ -41,5 +41,5 @@ stdenv.mkDerivation {
     nativeBuildInputs = inputsFun stdenv.cross.platform.uboot;
     makeUInitrd = makeUInitrdFun stdenv.cross.platform.uboot;
   };
-  inherit compressor;
+  inherit compressor prepend;
 }
diff --git a/pkgs/build-support/kernel/make-initrd.sh b/pkgs/build-support/kernel/make-initrd.sh
index 17b261f98407..08961a1b49c2 100644
--- a/pkgs/build-support/kernel/make-initrd.sh
+++ b/pkgs/build-support/kernel/make-initrd.sh
@@ -36,7 +36,10 @@ storePaths=$(perl $pathsFromGraph closure-*)
 
 # Put the closure in a gzipped cpio archive.
 mkdir -p $out
-(cd root && find * -print0 | cpio -o -H newc --null | perl $cpioClean | $compressor > $out/initrd)
+for PREP in $prepend; do
+  cat $PREP >> $out/initrd
+done
+(cd root && find * -print0 | cpio -o -H newc --null | perl $cpioClean | $compressor >> $out/initrd)
 
 if [ -n "$makeUInitrd" ]; then
     mv $out/initrd $out/initrd.gz
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index dce09bf29a17..89b23c8de4e9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -396,9 +396,9 @@ let
     inherit lib;
   };
 
-  makeInitrd = {contents, compressor ? "gzip -9n"}:
+  makeInitrd = { contents, compressor ? "gzip -9n", prepend }:
     import ../build-support/kernel/make-initrd.nix {
-      inherit stdenv perl perlArchiveCpio cpio contents ubootChooser compressor;
+      inherit stdenv perl perlArchiveCpio cpio contents ubootChooser compressor prepend;
     };
 
   makeWrapper = makeSetupHook { } ../build-support/setup-hooks/make-wrapper.sh;