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-rw-r--r--third_party/nix/src/libstore/nar-accessor.hh4
1 files changed, 2 insertions, 2 deletions
diff --git a/third_party/nix/src/libstore/nar-accessor.hh b/third_party/nix/src/libstore/nar-accessor.hh
index d4bd7366f8..8b18d4a36e 100644
--- a/third_party/nix/src/libstore/nar-accessor.hh
+++ b/third_party/nix/src/libstore/nar-accessor.hh
@@ -23,7 +23,7 @@ class JSONPlaceholder;
 
 /* Write a JSON representation of the contents of a NAR (except file
    contents). */
-void listNar(JSONPlaceholder& res, ref<FSAccessor> accessor, const Path& path,
-             bool recurse);
+void listNar(JSONPlaceholder& res, const ref<FSAccessor>& accessor,
+             const Path& path, bool recurse);
 
 }  // namespace nix