diff --git a/raspberry-pi/4/compile-overlays-dtmerge.nix b/raspberry-pi/4/compile-overlays-dtmerge.nix
new file mode 100644
index 000000000..7c69c8cff
--- /dev/null
+++ b/raspberry-pi/4/compile-overlays-dtmerge.nix
@@ -0,0 +1,29 @@
+# added this seperate compileDTS due to a change in nixpkgs which seperated `compileDTS`
+# see https://github.com/NixOS/nixpkgs/pull/251898
+{ lib, stdenv, stdenvNoCC, dtc, libraspberrypi }:
+
+with lib;
+# Compile single Device Tree overlay source
+# file (.dts) into its compiled variant (.dtb)
+({ name
+ , dtsFile
+ , includePaths ? [ ]
+ , extraPreprocessorFlags ? [ ]
+ }: stdenv.mkDerivation {
+  inherit name;
+
+  nativeBuildInputs = [ dtc ];
+
+  buildCommand =
+    let
+      includeFlagsStr = lib.concatMapStringsSep " " (includePath: "-I${includePath}") includePaths;
+      extraPreprocessorFlagsStr = lib.concatStringsSep " " extraPreprocessorFlags;
+    in
+    ''
+      $CC -E -nostdinc ${includeFlagsStr} -undef -D__DTS__ -x assembler-with-cpp ${extraPreprocessorFlagsStr} ${dtsFile} | \
+      dtc -I dts -O dtb -@ -o $out
+    '';
+})
+
+
+
diff --git a/raspberry-pi/4/pkgs-overlays.nix b/raspberry-pi/4/pkgs-overlays.nix
index cc639d46f..e1b56aa6d 100644
--- a/raspberry-pi/4/pkgs-overlays.nix
+++ b/raspberry-pi/4/pkgs-overlays.nix
@@ -3,6 +3,7 @@ let
   cfg = config.hardware.raspberry-pi."4".apply-overlays-dtmerge;
   dt_ao_overlay = _final: prev: {
     deviceTree.applyOverlays = prev.callPackage ./apply-overlays-dtmerge.nix { };
+    deviceTree.compileDTS = prev.callPackage ./compile-overlays-dtmerge.nix { };
   };
 in {
   options.hardware = {