diff --git a/pkgs/applications/networking/misc/zammad/update.nix b/pkgs/applications/networking/misc/zammad/update.nix
index 49e676d13f39..c3e1c7e1d594 100644
--- a/pkgs/applications/networking/misc/zammad/update.nix
+++ b/pkgs/applications/networking/misc/zammad/update.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     patchShebangs $out/bin/update.sh
     wrapProgram $out/bin/update.sh --prefix PATH : ${lib.makeBinPath buildInputs}
   '';
-  phases = [ "installPhase" ];
+  dontUnpack = true;
 
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [