diff --git a/nix/package.nix b/nix/package.nix
index 1dde3b88c8b..8736f0e8128 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -28,6 +28,8 @@ let
     finalAttrs: previousAttrs: {
       src = appSource;
       version = "${sourceVersion}-main.${shortRev}";
+      # nixpkgs' postPatch targets its pinned source and must not follow our moving source.
+      postPatch = "";
 
       pnpmDeps = pkgs.fetchPnpmDeps {
         inherit pnpm;