diff --git a/default.nix b/default.nix
index 7591c4c..8267fd3 100644
--- a/default.nix
+++ b/default.nix
@@ -6,6 +6,7 @@ pkgs.stdenv.mkDerivation {
   #src = ./db-main;
   src = builtins.fetchurl {
     url = "https://projects.info.unamur.be/dbmain/files/dbm-1102-linux-amd64-setup.tar.gz";
+    sha256 = "8f61e6069337dc734ac6f886b224329ec943cd4dafbd888611bd806373cb3296";
   };
 
   umpackCmd = "tar -xzf $src";