diff --git a/src/main/java/au/com/royalpay/payment/manage/application/core/impls/SimpleClientApplyServiceImpl.java b/src/main/java/au/com/royalpay/payment/manage/application/core/impls/SimpleClientApplyServiceImpl.java
index fc4b29bfb..6a5104131 100644
--- a/src/main/java/au/com/royalpay/payment/manage/application/core/impls/SimpleClientApplyServiceImpl.java
+++ b/src/main/java/au/com/royalpay/payment/manage/application/core/impls/SimpleClientApplyServiceImpl.java
@@ -140,7 +140,7 @@ public class SimpleClientApplyServiceImpl implements SimpleClientApplyService {
         String registerClientCode = RandomStringUtils.random(6, false, true);
         param.add("RoyalPay");
         param.add(registerClientCode);
-        String expireMin = (String) sysConfig.getOrDefault("sms.verification.code.expire", 3);
+        String expireMin = String.valueOf(sysConfig.getOrDefault("sms.verification.code.expire", 3));
         param.add(expireMin);
         try {
             sender.sendWithParam(nationCode.trim(), phoneNumber, REGISTER_CLIENT_TEMPLID, param, "RoyalPay", "", "");