diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index 75e279afdc372..1396e041f6877 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -10,8 +10,7 @@
   lib,
   pkgs,
   pigz,
-  nixUnstable,
-  perl,
+  nix,
   runCommand,
   rsync,
   shadow,
@@ -22,6 +21,7 @@
   writeReferencesToFile,
   writeScript,
   writeText,
+  closureInfo
 }:
 
 # WARNING: this API is unstable and may be subject to backwards-incompatible changes in the future.
@@ -228,19 +228,6 @@ rec {
       ${text}
     '';
 
-  nixRegistration = contents: runCommand "nix-registration" {
-    buildInputs = [ nixUnstable perl ];
-    # For obtaining the closure of `contents'.
-    exportReferencesGraph =
-      let contentsList = if builtins.isList contents then contents else [ contents ];
-      in map (x: [("closure-" + baseNameOf x) x]) contentsList;
-    }
-    ''
-      mkdir $out
-      printRegistration=1 perl ${pkgs.pathsFromGraph} closure-* > $out/db.dump
-      perl ${pkgs.pathsFromGraph} closure-* > $out/storePaths
-    '';
-
   # Create a "layer" (set of files).
   mkPureLayer = {
     # Name of the layer
@@ -579,20 +566,9 @@ rec {
         echo "Warning: only the database of the deepest Nix layer is loaded."
         echo "         If you want to use nix commands in the container, it would"
         echo "         be better to only have one layer that contains a nix store."
-        # This requires Nix 1.12 or higher
+
         export NIX_REMOTE=local?root=$PWD
-        ${nixUnstable}/bin/nix-store --load-db < ${nixRegistration contents}/db.dump
-
-        # We fill the store in order to run the 'verify' command that
-        # generates hash and size of output paths.
-        # Note when Nix 1.12 is be the stable one, the database dump
-        # generated by the exportReferencesGraph function will
-        # contains sha and size. See
-        # https://github.com/NixOS/nix/commit/c2b0d8749f7e77afc1c4b3e8dd36b7ee9720af4a
-        storePaths=$(cat ${nixRegistration contents}/storePaths)
-        echo "Copying everything to /nix/store (will take a while)..."
-        cp -prd $storePaths nix/store/
-        ${nixUnstable}/bin/nix-store --verify --check-contents
+        ${nix}/bin/nix-store --load-db < ${closureInfo {rootPaths = contents;}}/registration
 
         mkdir -p nix/var/nix/gcroots/docker/
         for i in ${lib.concatStringsSep " " contents}; do