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diff --git a/boost/histogram/detail/noop_mutex.hpp b/boost/histogram/detail/noop_mutex.hpp
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+++ b/boost/histogram/detail/noop_mutex.hpp
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+// Copyright 2019 Hans Dembinski
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_HISTOGRAM_DETAIL_NOOP_MUTEX_HPP
+#define BOOST_HISTOGRAM_DETAIL_NOOP_MUTEX_HPP
+
+namespace boost {
+namespace histogram {
+namespace detail {
+
+struct noop_mutex {
+  bool try_lock() noexcept { return true; }
+  void lock() noexcept {}
+  void unlock() noexcept {}
+};
+
+} // namespace detail
+} // namespace histogram
+} // namespace boost
+
+#endif