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-rw-r--r--third_party/nix/src/libutil/serialise.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/third_party/nix/src/libutil/serialise.cc b/third_party/nix/src/libutil/serialise.cc
index 4b12367196f1..34af4e840ab6 100644
--- a/third_party/nix/src/libutil/serialise.cc
+++ b/third_party/nix/src/libutil/serialise.cc
@@ -157,8 +157,8 @@ size_t StringSource::read(unsigned char* data, size_t len) {
 #error Coroutines are broken in this version of Boost!
 #endif
 
-std::unique_ptr<Source> sinkToSource(std::function<void(Sink&)> fun,
-                                     std::function<void()> eof) {
+std::unique_ptr<Source> sinkToSource(const std::function<void(Sink&)>& fun,
+                                     const std::function<void()>& eof) {
   struct SinkToSource : Source {
     using coro_t = boost::coroutines2::coroutine<std::string>;