diff --git a/README.md b/README.md
index 4edc2ec..8fc4bfd 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,2 @@
 # nixos-db-main
 Nixos Derivation for DB-Main (https://www.db-main.eu/).
-
-This needs the DB-Main files separately. The files are expected to be in a db-main directory, so that the db_main binary in in ./db-main/bin/db_main. This has been tested for version 11.0.2 .
diff --git a/default.nix b/default.nix
index 0035a7a..7591c4c 100644
--- a/default.nix
+++ b/default.nix
@@ -3,7 +3,13 @@ pkgs.stdenv.mkDerivation {
   pname = "db-main";
   version = "1.0";
 
-  src = ./db-main;
+  #src = ./db-main;
+  src = builtins.fetchurl {
+    url = "https://projects.info.unamur.be/dbmain/files/dbm-1102-linux-amd64-setup.tar.gz";
+  };
+
+  umpackCmd = "tar -xzf $src";
+
   nativeBuildInputs = [
     pkgs.makeWrapper
     pkgs.patchelf