diff --git a/protocol/src/main/java/com/zfoo/protocol/util/MathSafeUtil.java b/protocol/src/main/java/com/zfoo/protocol/util/MathSafeUtil.java
index 04120c8d1..8775d6277 100644
--- a/protocol/src/main/java/com/zfoo/protocol/util/MathSafeUtil.java
+++ b/protocol/src/main/java/com/zfoo/protocol/util/MathSafeUtil.java
@@ -3,9 +3,7 @@
 /**
  * @author Boone Jack
  */
-public class MathSafeUtil {
-    private MathSafeUtil() {
-    }
+public abstract class MathSafeUtil {
 
     public static int findNextPositivePowerOfTwo(int value) {
         assert value > Integer.MIN_VALUE && value < IOUtils.BYTES_PER_MB;