diff --git a/ethereumj-core/src/main/java/org/ethereum/core/Denomination.java b/ethereumj-core/src/main/java/org/ethereum/core/Denomination.java
index b895b8cf..8e2b6b97 100644
--- a/ethereumj-core/src/main/java/org/ethereum/core/Denomination.java
+++ b/ethereumj-core/src/main/java/org/ethereum/core/Denomination.java
@@ -1,6 +1,5 @@
 package org.ethereum.core;
 
-import java.math.BigDecimal;
 import java.math.BigInteger;
 
 public enum Denomination {
@@ -23,7 +22,7 @@ public enum Denomination {
 		return amount;
 	}
 	
-	private static BigInteger newBigInt(double value) {
-		return BigDecimal.valueOf(Math.pow(10, value)).toBigInteger();
+	private static BigInteger newBigInt(int value) {
+		return BigInteger.valueOf(10).pow(value);
 	}
 }
diff --git a/ethereumj-core/src/main/java/org/ethereum/core/Genesis.java b/ethereumj-core/src/main/java/org/ethereum/core/Genesis.java
index 54b00d83..ad217e99 100644
--- a/ethereumj-core/src/main/java/org/ethereum/core/Genesis.java
+++ b/ethereumj-core/src/main/java/org/ethereum/core/Genesis.java
@@ -18,7 +18,7 @@ public class Genesis extends Block {
     private static byte[] stateRoot = // TODO: Get stateRoot from actual state
     		Hex.decode("12582945fc5ad12c3e7b67c4fc37a68fc0d52d995bb7f7291ff41a2739a7ca16");
     private static byte[] txTrieRoot = new byte[0];
-    private static byte[] difficulty = BigInteger.valueOf((long) Math.pow(2, 22)).toByteArray();
+    private static byte[] difficulty = BigInteger.valueOf(2).pow(22).toByteArray();
     private static long number = 0;
     private static long minGasPrice = 0;
     private static long gasLimit = 1000000;