diff --git a/arbiter/util/http.hpp b/arbiter/util/http.hpp
index a93f418..858b980 100644
--- a/arbiter/util/http.hpp
+++ b/arbiter/util/http.hpp
@@ -108,7 +108,9 @@ class ARBITER_DLL Pool
     std::vector<Curl> m_curls;
     std::thread m_runner;
     std::size_t m_retry;
-    std::atomic<bool> m_stop;
+    // The explicit initialization is necessary on Linux for C++17.
+    // See the "Note" here: https://en.cppreference.com/cpp/atomic/atomic/atomic
+    std::atomic<bool> m_stop = false;
 
     std::mutex m_mutex;
     // Provide notification between a thread waiting on a Curl and one