diff --git a/include/ulib/utility/socket_ext.h b/include/ulib/utility/socket_ext.h
index 830c9e40..d2a67057 100644
--- a/include/ulib/utility/socket_ext.h
+++ b/include/ulib/utility/socket_ext.h
@@ -158,6 +158,9 @@ public:
 #endif
 
 private:
+	
+	friend class UREDISClusterMaster;
+	
 #ifdef USE_C_ARES
    static int   resolv_status;
    static char  resolv_hostname[INET6_ADDRSTRLEN];