diff --git a/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java b/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java
index 7f0845f6e8..b90feaf9a5 100644
--- a/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java
+++ b/ethereumj-core/src/main/java/org/ethereum/config/blockchain/ByzantiumConfig.java
@@ -44,6 +44,11 @@ public BigInteger getBLOCK_REWARD() {
         };
     }
 
+    @Override
+    public Constants getConstants() {
+        return constants;
+    }
+
     @Override
     public BigInteger calcDifficulty(BlockHeader curBlock, BlockHeader parent) {
         BigInteger pd = parent.getDifficultyBI();