diff --git a/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/constant/ErrorCodeConsts.java b/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/constant/ErrorCodeConsts.java
index f1958f9..2c38bd4 100644
--- a/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/constant/ErrorCodeConsts.java
+++ b/plusone-basic/plusone-basic-common/src/main/java/xyz/zhouxy/plusone/constant/ErrorCodeConsts.java
@@ -2,4 +2,8 @@ package xyz.zhouxy.plusone.constant;
 
 public class ErrorCodeConsts {
     public static final int DEFAULT_ERROR_CODE = 9999999;
+
+    private ErrorCodeConsts() {
+        throw new IllegalStateException("Utility class");
+    }
 }