diff --git a/flake.nix b/flake.nix
index 1aa1291..ad6346b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -97,18 +97,22 @@
         # Rustc bootstrap: symlink_file panics with "File exists" during
         # s390x cross-compilation. Multiple call sites use t!(symlink_file(...)).
         # Patch the symlink_file method body to remove existing dest first.
-        (final: prev: let
-          patchedRustcUnwrapped = prev.rustc-unwrapped.overrideAttrs (old: {
-            patches = (old.patches or [ ]) ++ [
-              ./patches/rustc-symlink-file-eexist.patch
-            ];
-          });
-        in {
-          rustc-unwrapped = patchedRustcUnwrapped;
-          rustc = prev.rustc.override {
+        (
+          final: prev:
+          let
+            patchedRustcUnwrapped = prev.rustc-unwrapped.overrideAttrs (old: {
+              patches = (old.patches or [ ]) ++ [
+                ./patches/rustc-symlink-file-eexist.patch
+              ];
+            });
+          in
+          {
             rustc-unwrapped = patchedRustcUnwrapped;
-          };
-        })
+            rustc = prev.rustc.override {
+              rustc-unwrapped = patchedRustcUnwrapped;
+            };
+          }
+        )
       ];
 
       # Native builds