diff --git a/etcd/SyncClient.hpp b/etcd/SyncClient.hpp
index b50bf39..4369e80 100644
--- a/etcd/SyncClient.hpp
+++ b/etcd/SyncClient.hpp
@@ -1,6 +1,8 @@
 #ifndef __ETCD_SYNC_CLIENT_HPP__
 #define __ETCD_SYNC_CLIENT_HPP__
 
+#include <limits>
+
 #include "etcd/Client.hpp"
 
 namespace etcd