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-rw-r--r--third_party/nix/src/libutil/thread-pool.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/thread-pool.hh b/third_party/nix/src/libutil/thread-pool.hh
index 48888c0688..0efc4c1bfc 100644
--- a/third_party/nix/src/libutil/thread-pool.hh
+++ b/third_party/nix/src/libutil/thread-pool.hh
@@ -17,7 +17,7 @@ MakeError(ThreadPoolShutDown, Error);
    (lambdas). */
 class ThreadPool {
  public:
-  ThreadPool(size_t maxThreads = 0);
+  explicit ThreadPool(size_t maxThreads = 0);
 
   ~ThreadPool();