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-rw-r--r--third_party/nix/src/libutil/lazy.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/lazy.hh b/third_party/nix/src/libutil/lazy.hh
index b564b481fc38..5c6ff5d8df6a 100644
--- a/third_party/nix/src/libutil/lazy.hh
+++ b/third_party/nix/src/libutil/lazy.hh
@@ -25,7 +25,7 @@ class Lazy {
   std::exception_ptr ex;
 
  public:
-  Lazy(Init init) : init(init) {}
+  explicit Lazy(Init init) : init(init) {}
 
   const T& operator()() {
     std::call_once(done, [&]() {