diff --git a/actuator/src/main/java/org/tron/core/vm/Op.java b/actuator/src/main/java/org/tron/core/vm/Op.java
index 864a11e90b2..4a2e1a62a8e 100644
--- a/actuator/src/main/java/org/tron/core/vm/Op.java
+++ b/actuator/src/main/java/org/tron/core/vm/Op.java
@@ -262,15 +262,15 @@ public class Op {
   static {
     Field[] fields = Op.class.getDeclaredFields();
     for (Field field : fields) {
-      if ("int".equals(field.getType().getName())) {
-        int op = 0;
-        try {
+      try {
+        int op;
+        if (field.getType() == int.class) {
           op = field.getInt(Op.class);
-        } catch (IllegalAccessException e) {
-          e.printStackTrace();
+          OpName[op] = field.getName();
+          stringToByteMap.put(field.getName(), (byte) op);
         }
-        OpName[op] = field.getName();
-        stringToByteMap.put(field.getName(), (byte) op);
+      } catch (IllegalAccessException e) {
+        e.printStackTrace();
       }
     }
   }
@@ -286,4 +286,5 @@ public static String getNameOf(byte opCode) {
   public static byte getOpOf(String opCode) {
     return stringToByteMap.get(opCode);
   }
+
 }