diff --git a/src/main/java/io/zksync/utils/WalletUtils.java b/src/main/java/io/zksync/utils/WalletUtils.java
index 4f0a002..4b028ba 100644
--- a/src/main/java/io/zksync/utils/WalletUtils.java
+++ b/src/main/java/io/zksync/utils/WalletUtils.java
@@ -130,8 +130,15 @@ public static BigInteger estimateCustomBridgeDepositL2Gas(String l1BridgeAddress
     }
 
     public static String applyL1ToL2Alias(String address){
-        String a = Numeric.toHexStringWithPrefix(Numeric.toBigInt(address).add(Numeric.toBigInt("0x1111000000000000000000000000000000001111")).mod(BigInteger.valueOf(2).pow(160)));
-        return Numeric.toHexStringWithPrefix(Numeric.toBigInt(address).add(Numeric.toBigInt("0x1111000000000000000000000000000000001111")).mod(BigInteger.valueOf(2).pow(160)));
+        return Numeric.toHexStringWithPrefixZeroPadded(Numeric.toBigInt(address).add(Numeric.toBigInt("0x1111000000000000000000000000000000001111")).mod(BigInteger.valueOf(2).pow(160)), 40);
+    }
+
+    public static String undoL1ToL2Alias(String address){
+        BigInteger result = Numeric.toBigInt(address).subtract(Numeric.toBigInt("0x1111000000000000000000000000000000001111"));
+        if (result.compareTo(BigInteger.ZERO) < 0){
+            result.add(BigInteger.valueOf(2).pow(160));
+        }
+        return Numeric.toHexStringWithPrefixZeroPadded(result, 40);
     }
 
     public static String getERC20DefaultBridgeData(String l1TokenAddress, Web3j provider, Credentials credentials, ContractGasProvider gasProvider){
diff --git a/src/test/java/io/zksync/utils/ContractDeployerTest.java b/src/test/java/io/zksync/utils/ContractDeployerTest.java
index 86bfb56..a7dc819 100644
--- a/src/test/java/io/zksync/utils/ContractDeployerTest.java
+++ b/src/test/java/io/zksync/utils/ContractDeployerTest.java
@@ -20,6 +20,18 @@ public void computeL2Create2AddressActual() {
         Assertions.assertEquals(expected, result.getValue());
     }
 
+    @Test
+    public void testApplyAlias(){
+        String nonZeroPadded = WalletUtils.applyL1ToL2Alias("0x702942B8205E5dEdCD3374E5f4419843adA76Eeb");
+        Assertions.assertEquals("0x813A42B8205E5DedCd3374e5f4419843ADa77FFC".toLowerCase(), nonZeroPadded.toLowerCase());
+    }
+
+    @Test
+    public void testUndoAlias(){
+        String nonZeroPadded = WalletUtils.applyL1ToL2Alias("0x702942B8205E5dEdCD3374E5f4419843adA76Eeb");
+        Assertions.assertEquals("0x813A42B8205E5DedCd3374e5f4419843ADa77FFC".toLowerCase(), nonZeroPadded.toLowerCase());
+    }
+
     @Test
     public void computeL2CreateAddressActual() {
         String expected = "0x5107b7154dfc1d3b7f1c4e19b5087e1d3393bcf4";