diff --git a/shiro-example-chapter16/src/main/java/com/github/zhangkaitao/shiro/chapter16/service/PasswordHelper.java b/shiro-example-chapter16/src/main/java/com/github/zhangkaitao/shiro/chapter16/service/PasswordHelper.java
index c12cbbc9..04dfd4fc 100644
--- a/shiro-example-chapter16/src/main/java/com/github/zhangkaitao/shiro/chapter16/service/PasswordHelper.java
+++ b/shiro-example-chapter16/src/main/java/com/github/zhangkaitao/shiro/chapter16/service/PasswordHelper.java
@@ -19,9 +19,9 @@ public class PasswordHelper {
     private RandomNumberGenerator randomNumberGenerator = new SecureRandomNumberGenerator();
 
     @Value("${password.algorithmName}")
-    private String algorithmName = "md5";
+    private String algorithmName;
     @Value("${password.hashIterations}")
-    private int hashIterations = 2;
+    private int hashIterations;
 
     public void setRandomNumberGenerator(RandomNumberGenerator randomNumberGenerator) {
         this.randomNumberGenerator = randomNumberGenerator;