diff --git a/cpp/exports.hpp b/cpp/exports.hpp
index 261f9fda3374aeb1ea5e43aabaebbefda9cedfcb..6172e831d63aff837e72b386cfd771630ac3818f 100644
--- a/cpp/exports.hpp
+++ b/cpp/exports.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "graph.hpp"
+#include "histogram.hpp"
 #include <array>
 #include <iostream>
 #include <vector>
@@ -64,3 +65,9 @@ template <typename T, std::size_t N>
 std::ostream& operator<<(std::ostream& s, const std::array<T, N>& v) {
     return output_array(s, std::begin(v), std::end(v));
 }
+
+std::ostream &operator<<(std::ostream &s, const Histogram &h) {
+    s << h.getHistogram();
+    return s;
+}
+