diff --git a/etcd/Client.hpp b/etcd/Client.hpp
index 2cb4a7f..6bc7d77 100644
--- a/etcd/Client.hpp
+++ b/etcd/Client.hpp
@@ -43,7 +43,7 @@ namespace etcd
      * @param load_balancer is the load balance strategy, can be one of round_robin/pick_first/grpclb/xds.
      */
     Client(std::string const & etcd_url,
-           const unsigned int& timeout = std::numeric_limits<unsigned int>::max(),
+           const long& timeout = std::numeric_limits<long>::max(),
            std::string const & load_balancer = "round_robin");
 
     /**
@@ -59,7 +59,7 @@ namespace etcd
     Client(std::string const & etcd_url,
            std::string const & username,
            std::string const & password,
-           const unsigned int& timeout = std::numeric_limits<unsigned int>::max(),
+           const long& timeout = std::numeric_limits<long>::max(),
            std::string const & load_balancer = "round_robin");
 
     /**