diff --git a/docker.nix b/docker.nix
index 203a06b53..52199af66 100644
--- a/docker.nix
+++ b/docker.nix
@@ -8,6 +8,7 @@
 , extraPkgs ? []
 , maxLayers ? 100
 , nixConf ? {}
+, flake-registry ? null
 }:
 let
   defaultPkgs = with pkgs; [
@@ -247,7 +248,16 @@ let
       mkdir -p $out/bin $out/usr/bin
       ln -s ${pkgs.coreutils}/bin/env $out/usr/bin/env
       ln -s ${pkgs.bashInteractive}/bin/bash $out/bin/sh
-    '';
+
+    '' + (lib.optionalString (flake-registry != null) ''
+      nixCacheDir="/root/.cache/nix"
+      mkdir -p $out$nixCacheDir
+      globalFlakeRegistryPath="$nixCacheDir/flake-registry.json"
+      ln -s ${flake-registry}/flake-registry.json $out$globalFlakeRegistryPath
+      mkdir -p $out/nix/var/nix/gcroots/auto
+      rootName=$(${pkgs.nix}/bin/nix --extra-experimental-features nix-command hash file --type sha1 --base32 <(echo -n $globalFlakeRegistryPath))
+      ln -s $globalFlakeRegistryPath $out/nix/var/nix/gcroots/auto/$rootName
+    '');
 
 in
 pkgs.dockerTools.buildLayeredImageWithNixDb {