diff --git a/pkgs/by-name/fi/firefly-desktop/package.nix b/pkgs/by-name/fi/firefly-desktop/package.nix
index 1e0c4175d153..ccc35bad670d 100644
--- a/pkgs/by-name/fi/firefly-desktop/package.nix
+++ b/pkgs/by-name/fi/firefly-desktop/package.nix
@@ -20,12 +20,11 @@ appimageTools.wrapType2 {
   extraPkgs = pkgs: [ pkgs.libsecret ];
 
   extraInstallCommands = ''
-    mkdir -p $out/share/applications $out/share/pixmaps
-    cp ${appimageContents}/desktop.desktop $out/share/applications/firefly-desktop.desktop
+    install -D ${appimageContents}/desktop.desktop $out/share/applications/firefly-desktop.desktop
     substituteInPlace $out/share/applications/firefly-desktop.desktop \
-      --replace 'Exec=AppRun' 'Exec=firefly-desktop' \
-      --replace 'Icon=desktop' 'Icon=firefly-desktop'
-    cp ${appimageContents}/desktop.png $out/share/pixmaps/firefly-desktop.png
+      --replace-fail 'Exec=AppRun' 'Exec=firefly-desktop' \
+      --replace-fail 'Icon=desktop' 'Icon=firefly-desktop'
+    install -D ${appimageContents}/desktop.png $out/share/icons/firefly-desktop.png
   '';
 
   meta = {