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-rw-r--r--third_party/nix/src/libutil/serialise.hh3
1 files changed, 2 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/serialise.hh b/third_party/nix/src/libutil/serialise.hh
index d8c8b181f411..a5992b50ec6e 100644
--- a/third_party/nix/src/libutil/serialise.hh
+++ b/third_party/nix/src/libutil/serialise.hh
@@ -209,7 +209,8 @@ struct LambdaSource : Source {
 /* Convert a function that feeds data into a Sink into a Source. The
    Source executes the function as a coroutine. */
 std::unique_ptr<Source> sinkToSource(
-    std::function<void(Sink&)> fun, std::function<void()> eof = []() {
+    const std::function<void(Sink&)>& fun,
+    const std::function<void()>& eof = []() {
       throw EndOfFile("coroutine has finished");
     });