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-rw-r--r--third_party/nix/src/libutil/finally.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/finally.hh b/third_party/nix/src/libutil/finally.hh
index 8d3083b6a3ac..2ead8661a6e7 100644
--- a/third_party/nix/src/libutil/finally.hh
+++ b/third_party/nix/src/libutil/finally.hh
@@ -8,6 +8,6 @@ class Finally {
   std::function<void()> fun;
 
  public:
-  Finally(std::function<void()> fun) : fun(fun) {}
+  explicit Finally(std::function<void()> fun) : fun(fun) {}
   ~Finally() { fun(); }
 };