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diff --git a/third_party/immer/benchmark/set/unsigned/generator.ipp b/third_party/immer/benchmark/set/unsigned/generator.ipp
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+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <random>
+#include <vector>
+#include <cassert>
+#include <functional>
+#include <algorithm>
+
+#define GENERATOR_T generate_unsigned
+
+namespace {
+
+struct GENERATOR_T
+{
+    auto operator() (std::size_t runs) const
+    {
+        assert(runs > 0);
+        auto engine = std::default_random_engine{42};
+        auto dist = std::uniform_int_distribution<unsigned>{};
+        auto r = std::vector<unsigned>(runs);
+        std::generate_n(r.begin(), runs, std::bind(dist, engine));
+        return r;
+    }
+};
+
+} // namespace