From 023c93e4e504d0954b01cdde13bd293865880388 Mon Sep 17 00:00:00 2001
From: Cheney Wang <38240633+Cheney-W@users.noreply.github.com>
Date: Tue, 11 Feb 2020 10:07:45 -0800
Subject: [PATCH] Include missing <ostream>

---
 core/src/histogram.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/core/src/histogram.cc b/core/src/histogram.cc
index 4a40d535..80235298 100644
--- a/core/src/histogram.cc
+++ b/core/src/histogram.cc
@@ -4,6 +4,7 @@
 #include <cassert>
 #include <iterator>
 #include <numeric>
+#include <ostream>
 
 namespace prometheus {