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-rw-r--r--third_party/nix/src/nix/ls.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/nix/ls.cc b/third_party/nix/src/nix/ls.cc
index 13b7bbbbb9..5b052f8fcc 100644
--- a/third_party/nix/src/nix/ls.cc
+++ b/third_party/nix/src/nix/ls.cc
@@ -74,7 +74,7 @@ struct MixLs : virtual Args, MixJSON {
            showDirectory);
   }
 
-  void list(ref<FSAccessor> accessor) {
+  void list(const ref<FSAccessor>& accessor) {
     if (path == "/") {
       path = "";
     }