diff --git a/app/modules/net.c b/app/modules/net.c
index 516ccab9..faab54de 100644
--- a/app/modules/net.c
+++ b/app/modules/net.c
@@ -594,6 +594,7 @@ static void socket_connect(struct espconn *pesp_conn)
   {
 #ifdef CLIENT_SSL_ENABLE
     if(nud->secure){
+      espconn_secure_set_size(ESPCONN_CLIENT, 5120); /* set SSL buffer size */
       espconn_secure_connect(pesp_conn);
     }
     else