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-rw-r--r--third_party/nix/src/nix-store/dotgraph.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/nix-store/dotgraph.hh b/third_party/nix/src/nix-store/dotgraph.hh
index c7069451e114..20fc357b1bd4 100644
--- a/third_party/nix/src/nix-store/dotgraph.hh
+++ b/third_party/nix/src/nix-store/dotgraph.hh
@@ -6,6 +6,6 @@ namespace nix {
 
 class Store;
 
-void printDotGraph(ref<Store> store, const PathSet& roots);
+void printDotGraph(const ref<Store>& store, const PathSet& roots);
 
 }  // namespace nix