diff --git a/rskj-core/src/main/java/org/ethereum/vm/OpCodes.java b/rskj-core/src/main/java/org/ethereum/vm/OpCodes.java
index ff7a4af7f1..822e9f0318 100644
--- a/rskj-core/src/main/java/org/ethereum/vm/OpCodes.java
+++ b/rskj-core/src/main/java/org/ethereum/vm/OpCodes.java
@@ -328,7 +328,7 @@ private OpCodes() {
     /**
      * (0x5e)
      */
-    static final byte OP_MCOPY = 0x5e;
+    public static final byte OP_MCOPY = 0x5e;
 
     /*  Push Operations */
     /**