diff --git a/pkgs/by-name/lm/lmstudio/darwin.nix b/pkgs/by-name/lm/lmstudio/darwin.nix
index f18a880feabe4..8666739fff909 100644
--- a/pkgs/by-name/lm/lmstudio/darwin.nix
+++ b/pkgs/by-name/lm/lmstudio/darwin.nix
@@ -1,7 +1,7 @@
 {
   stdenv,
   fetchurl,
-  undmg,
+  _7zz,
   meta,
   pname,
   version,
@@ -16,7 +16,7 @@ stdenv.mkDerivation {
     inherit url hash;
   };
 
-  nativeBuildInputs = [ undmg ];
+  nativeBuildInputs = [ _7zz ];
 
   sourceRoot = ".";
 
@@ -30,24 +30,5 @@ stdenv.mkDerivation {
   # LM Studio ships Scripts inside the App Bundle, which may be messed up by standard fixups
   dontFixup = true;
 
-  # undmg doesn't support APFS and 7zz does break the xattr. Took that approach from https://github.com/NixOS/nixpkgs/blob/a3c6ed7ad2649c1a55ffd94f7747e3176053b833/pkgs/by-name/in/insomnia/package.nix#L52
-  unpackCmd = ''
-    echo "Creating temp directory"
-    mnt=$(TMPDIR=/tmp mktemp -d -t nix-XXXXXXXXXX)
-    function finish {
-      echo "Ejecting temp directory"
-      /usr/bin/hdiutil detach $mnt -force
-      rm -rf $mnt
-    }
-    # Detach volume when receiving SIG "0"
-    trap finish EXIT
-    # Mount DMG file
-    echo "Mounting DMG file into \"$mnt\""
-    /usr/bin/hdiutil attach -nobrowse -mountpoint $mnt $curSrc
-    # Copy content to local dir for later use
-    echo 'Copying extracted content into "sourceRoot"'
-    cp -a $mnt/LM\ Studio.app $PWD/
-  '';
-
   inherit passthru;
 }