diff --git a/flake.nix b/flake.nix
index 2b44207..375f8c9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -95,12 +95,12 @@
           };
         })
         # Rustc bootstrap: symlink_file panics with "File exists" during
-        # s390x cross-compilation (lib.rs:1823 calls t!(self.symlink_file(link, dst))).
-        # Patch symlink_file in lib.rs to remove existing destination first.
+        # s390x cross-compilation. Multiple call sites use t!(symlink_file(...)).
+        # Patch the symlink_file method body to remove existing dest first.
         (final: prev: {
           rustc = prev.rustc.overrideAttrs (old: {
             postPatch = (old.postPatch or "") + ''
-              sed -i 's|if !self.config.dry_run() { symlink_file(src.as_ref(), link.as_ref())|if !self.config.dry_run() { let _ = std::fs::remove_file(link.as_ref()); symlink_file(src.as_ref(), link.as_ref())|' src/bootstrap/src/lib.rs
+              sed -i 's|if !self.config.dry_run() { symlink_file(src.as_ref(), link.as_ref()) }|if !self.config.dry_run() { let _ = std::fs::remove_file(link.as_ref()); symlink_file(src.as_ref(), link.as_ref()) }|' src/bootstrap/src/lib.rs
             '';
           });
         })