diff --git a/ethereumj-core/src/main/java/org/ethereum/net/message/ReasonCode.java b/ethereumj-core/src/main/java/org/ethereum/net/message/ReasonCode.java
index d38e183d..86d6b3c5 100644
--- a/ethereumj-core/src/main/java/org/ethereum/net/message/ReasonCode.java
+++ b/ethereumj-core/src/main/java/org/ethereum/net/message/ReasonCode.java
@@ -74,7 +74,7 @@ public enum ReasonCode {
     }
 
     public static ReasonCode fromInt(int i) {
-        ReasonCode type = intToTypeMap.get(Integer.valueOf(i));
+        ReasonCode type = intToTypeMap.get(i);
         if (type == null)
             return ReasonCode.UNKNOWN;
         return type;
diff --git a/ethereumj-core/src/main/java/org/ethereum/net/p2p/P2pMessageCodes.java b/ethereumj-core/src/main/java/org/ethereum/net/p2p/P2pMessageCodes.java
index 83ee8587..47fc3280 100644
--- a/ethereumj-core/src/main/java/org/ethereum/net/p2p/P2pMessageCodes.java
+++ b/ethereumj-core/src/main/java/org/ethereum/net/p2p/P2pMessageCodes.java
@@ -79,7 +79,7 @@ public enum P2pMessageCodes {
     }
 
     public static P2pMessageCodes fromByte(byte i) {
-        P2pMessageCodes type = intToTypeMap.get(Integer.valueOf(i));
+        P2pMessageCodes type = intToTypeMap.get((int) i);
         return type;
     }
 
diff --git a/ethereumj-core/src/main/java/org/ethereum/util/RLP.java b/ethereumj-core/src/main/java/org/ethereum/util/RLP.java
index d8fb7fa6..7443e074 100644
--- a/ethereumj-core/src/main/java/org/ethereum/util/RLP.java
+++ b/ethereumj-core/src/main/java/org/ethereum/util/RLP.java
@@ -420,7 +420,7 @@ public class RLP {
             while (pos < endPos) {
 
                 if (level == levelToIndex)
-                    index.add(new Integer(pos));
+                    index.add(pos);
 
                 // It's a list with a payload more than 55 bytes
                 // data[0] - 0xF7 = how many next bytes allocated
@@ -925,7 +925,7 @@ public class RLP {
             return (inputLong == 0) ? ByteUtil.EMPTY_BYTE_ARRAY : asUnsignedByteArray(BigInteger.valueOf(inputLong));
         } else if (input instanceof Integer) {
             Integer inputInt = (Integer) input;
-            return (inputInt == 0) ? ByteUtil.EMPTY_BYTE_ARRAY : asUnsignedByteArray(BigInteger.valueOf(inputInt.intValue()));
+            return (inputInt == 0) ? ByteUtil.EMPTY_BYTE_ARRAY : asUnsignedByteArray(BigInteger.valueOf(inputInt));
         } else if (input instanceof BigInteger) {
             BigInteger inputBigInt = (BigInteger) input;
             return (inputBigInt == BigInteger.ZERO) ? ByteUtil.EMPTY_BYTE_ARRAY : asUnsignedByteArray(inputBigInt);
diff --git a/ethereumj-core/src/test/java/test/ethereum/util/RLPTest.java b/ethereumj-core/src/test/java/test/ethereum/util/RLPTest.java
index 42ba6157..8745a395 100644
--- a/ethereumj-core/src/test/java/test/ethereum/util/RLPTest.java
+++ b/ethereumj-core/src/test/java/test/ethereum/util/RLPTest.java
@@ -614,7 +614,7 @@ public class RLPTest {
 
     @Test
     public void testEncodeZero() {
-        Integer test = new Integer(0);
+        Integer test = 0;
         String expected = "80";
         byte[] encoderesult = RLP.encode(test);
         assertEquals(expected, Hex.toHexString(encoderesult));
@@ -625,7 +625,7 @@ public class RLPTest {
 
     @Test
     public void testEncodeSmallInteger() {
-        Integer test = new Integer(15);
+        Integer test = 15;
         String expected = "0f";
         byte[] encoderesult = RLP.encode(test);
         assertEquals(expected, Hex.toHexString(encoderesult));
@@ -637,7 +637,7 @@ public class RLPTest {
 
     @Test
     public void testEncodeMediumInteger() {
-        Integer test = new Integer(1000);
+        Integer test = 1000;
         String expected = "8203e8";
         byte[] encoderesult = RLP.encode(test);
         assertEquals(expected, Hex.toHexString(encoderesult));
@@ -646,7 +646,7 @@ public class RLPTest {
         int result = byteArrayToInt(decodeResult);
         assertEquals(test, Integer.valueOf(result));
 
-        test = new Integer(1024);
+        test = 1024;
         expected = "820400";
         encoderesult = RLP.encode(test);
         assertEquals(expected, Hex.toHexString(encoderesult));