diff --git a/pkgs/emulationstation-de.nix b/pkgs/emulationstation-de.nix
index 50e4cde..841a67c 100644
--- a/pkgs/emulationstation-de.nix
+++ b/pkgs/emulationstation-de.nix
@@ -15,64 +15,85 @@
   poppler,
   pugixml,
   SDL2,
+  writeText,
   ...
-}:
-
-let
+}: let
   version = "3.1.0";
   hash = "sha256-v9nOY9T5VOVLBUKoDXqwYa1iYvW42iGA+3kpPUOmHkg=";
-in stdenv.mkDerivation {
-  pname = "emulationstation-de";
-  inherit version;
 
-  src = fetchzip {
-    url = "https://gitlab.com/es-de/emulationstation-de/-/archive/v${version}/emulationstation-de-v${version}.tar.gz";
-    inherit hash;
-  };
-
-  patches = [ ./emulationstation-de.patch ];
-
-  nativeBuildInputs = [
-    cmake
-    pkg-config
-  ];
-
-  buildInputs = [
-    alsa-lib
-    curl
-    ffmpeg
-    freeimage
-    freetype
-    harfbuzz
-    icu
-    libgit2
-    poppler
-    pugixml
-    SDL2
-  ];
-
-  installPhase = ''
-    install -D ../es-de                                        $out/bin/es-de
-    install -D ../es-pdf-convert                               $out/bin/es-pdf-convert
-    install -D ../LICENSE                                      $out/share/es-de/LICENSE
-    install -D ../es-app/assets/es-de.6.gz                     $out/share/man/man6/es-de.6.gz
-    install -D ../es-app/assets/org.es_de.frontend.desktop     $out/share/applications/org.es_de.frontend.desktop
-    install -D ../es-app/assets/org.es_de.frontend.appdata.xml $out/share/metainfo/org.es_de.frontend.appdata.xml
-    install -D ../es-app/assets/org.es_de.frontend.svg         $out/share/icons/hicolor/scalable/apps/org.es_de.frontend.svg
-    install -D ../es-app/assets/org.es_de.frontend.svg         $out/share/pixmaps/org.es_de.frontend.svg
-
-    mkdir -p $out/share/es-de/
-    cp -r ../licenses/  $out/share/es-de/licenses/
-    cp -r ../themes/    $out/share/es-de/themes/
-    cp -r ../resources/ $out/share/es-de/resources/
+  patch = writeText "emulationstation-de.patch" ''
+    --- a/resources/systems/unix/es_find_rules.xml
+    +++ b/resources/systems/unix/es_find_rules.xml
+    @@ -19,6 +19,8 @@
+                 <entry>~/.config/retroarch/cores</entry>
+                 <!-- FreeBSD repository -->
+                 <entry>/usr/local/lib/libretro</entry>
+    +            <!-- NixOS / Nixpkgs -->
+    +            <entry>/run/current-system/sw/lib/retroarch/cores</entry>
+             </rule>
+         </core>
+         <emulator name="ADVANCEMAME">
+    @@ -667,4 +669,4 @@
+                 <entry>~/bin/ZEsarUX/zesarux</entry>
+             </rule>
+         </emulator>
+    -</ruleList>
+    \ No newline at end of file
+    +</ruleList>
   '';
+in
+  stdenv.mkDerivation {
+    pname = "emulationstation-de";
+    inherit version;
 
-  meta = {
-    description = "EmulationStation Desktop Edition is a frontend for browsing and launching games from your multi-platform game collection";
-    homepage = "https://es-de.org";
-    maintainers = with lib.maintainers; [ ivarmedi ];
-    license = lib.licenses.mit;
-    platforms = lib.platforms.linux;
-    mainProgram = "emulationstation";
-  };
-}
+    src = fetchzip {
+      url = "https://gitlab.com/es-de/emulationstation-de/-/archive/v${version}/emulationstation-de-v${version}.tar.gz";
+      inherit hash;
+    };
+
+    patches = [patch];
+
+    nativeBuildInputs = [
+      cmake
+      pkg-config
+    ];
+
+    buildInputs = [
+      alsa-lib
+      curl
+      ffmpeg
+      freeimage
+      freetype
+      harfbuzz
+      icu
+      libgit2
+      poppler
+      pugixml
+      SDL2
+    ];
+
+    installPhase = ''
+      install -D ../es-de                                        $out/bin/es-de
+      install -D ../es-pdf-convert                               $out/bin/es-pdf-convert
+      install -D ../LICENSE                                      $out/share/es-de/LICENSE
+      install -D ../es-app/assets/es-de.6.gz                     $out/share/man/man6/es-de.6.gz
+      install -D ../es-app/assets/org.es_de.frontend.desktop     $out/share/applications/org.es_de.frontend.desktop
+      install -D ../es-app/assets/org.es_de.frontend.appdata.xml $out/share/metainfo/org.es_de.frontend.appdata.xml
+      install -D ../es-app/assets/org.es_de.frontend.svg         $out/share/icons/hicolor/scalable/apps/org.es_de.frontend.svg
+      install -D ../es-app/assets/org.es_de.frontend.svg         $out/share/pixmaps/org.es_de.frontend.svg
+
+      mkdir -p $out/share/es-de/
+      cp -r ../licenses/  $out/share/es-de/licenses/
+      cp -r ../themes/    $out/share/es-de/themes/
+      cp -r ../resources/ $out/share/es-de/resources/
+    '';
+
+    meta = {
+      description = "EmulationStation Desktop Edition is a frontend for browsing and launching games from your multi-platform game collection";
+      homepage = "https://es-de.org";
+      maintainers = with lib.maintainers; [ivarmedi];
+      license = lib.licenses.mit;
+      platforms = lib.platforms.linux;
+      mainProgram = "emulationstation";
+    };
+  }
diff --git a/pkgs/emulationstation-de.patch b/pkgs/emulationstation-de.patch
deleted file mode 100644
index 48b25f2..0000000
--- a/pkgs/emulationstation-de.patch
+++ /dev/null
@@ -1,18 +0,0 @@
---- a/resources/systems/unix/es_find_rules.xml
-+++ b/resources/systems/unix/es_find_rules.xml
-@@ -19,6 +19,8 @@
-             <entry>~/.config/retroarch/cores</entry>
-             <!-- FreeBSD repository -->
-             <entry>/usr/local/lib/libretro</entry>
-+            <!-- NixOS / Nixpkgs -->
-+            <entry>/run/current-system/sw/lib/retroarch/cores</entry>
-         </rule>
-     </core>
-     <emulator name="ADVANCEMAME">
-@@ -667,4 +669,4 @@
-             <entry>~/bin/ZEsarUX/zesarux</entry>
-         </rule>
-     </emulator>
--</ruleList>
-\ No newline at end of file
-+</ruleList>