diff --git a/include/opendht/http.h b/include/opendht/http.h
index cccbe18d..0efc26f2 100644
--- a/include/opendht/http.h
+++ b/include/opendht/http.h
@@ -113,7 +113,7 @@ public:
 
 private:
     unsigned int id_;
-    static unsigned int ids_;
+    static std::atomic_uint ids_;
 
     asio::io_context& ctx_;
     std::unique_ptr<socket_t> socket_;
@@ -323,9 +323,9 @@ private:
     std::string host_;
 
     unsigned int id_;
+    static std::atomic_uint ids_;
     asio::io_context& ctx_;
     sa_family_t family_ = AF_UNSPEC;
-    static unsigned int ids_;
     std::shared_ptr<Connection> conn_;
     std::shared_ptr<Resolver> resolver_;
 
diff --git a/src/http.cpp b/src/http.cpp
index 8f80dffa..c37d149c 100644
--- a/src/http.cpp
+++ b/src/http.cpp
@@ -77,7 +77,7 @@ Url::Url(const std::string& url): url(url)
 
 // connection
 
-unsigned int Connection::ids_ = 1;
+std::atomic_uint Connection::ids_ {1};
 
 Connection::Connection(asio::io_context& ctx, const bool ssl, std::shared_ptr<dht::Logger> l)
     : id_(Connection::ids_++), ctx_(ctx), logger_(l)
@@ -438,7 +438,7 @@ Resolver::resolve(const std::string& host, const std::string& service)
 
 // Request
 
-unsigned int Request::ids_ = 1;
+std::atomic_uint Request::ids_ {1};
 
 
 Request::Request(asio::io_context& ctx, const std::string& url, const Json::Value& json, OnJsonCb jsoncb,