diff --git a/flake.nix b/flake.nix
index 985a4add6..c838dc244 100644
--- a/flake.nix
+++ b/flake.nix
@@ -272,7 +272,7 @@
             inherit (icons) logo favicon;
           in
           old: {
-            postPatch =
+            postPatch = old.postPatch or "" +
               ''
                 cp '${logo}' src/assets/logo.svg