diff --git a/core/src/main/java/knaccc/monero/crypto/CryptoUtil.java b/core/src/main/java/knaccc/monero/crypto/CryptoUtil.java
index b0862d2dfc..d025fb3527 100755
--- a/core/src/main/java/knaccc/monero/crypto/CryptoUtil.java
+++ b/core/src/main/java/knaccc/monero/crypto/CryptoUtil.java
@@ -42,7 +42,11 @@ public class CryptoUtil {
     public static BigInteger l = BigInteger.valueOf(2).pow(252).add(new BigInteger("27742317777372353535851937790883648493"));
 
     public static String toCanonicalTxKey(String txKey) {
-        return HexEncoder.getString(new BigInteger(HexEncoder.getBytes(txKey)).mod(l).toByteArray());
+        byte[] bytes = HexEncoder.getBytes(txKey);
+        byte[] asLittleEndianBytes = ensure32BytesAndConvertToLittleEndian(bytes);
+        byte[] nonMalleable = new BigInteger(asLittleEndianBytes).mod(l).toByteArray();
+        byte[] nonMalleableAsLittleEndian = ensure32BytesAndConvertToLittleEndian(nonMalleable);
+        return HexEncoder.getString(nonMalleableAsLittleEndian);
     }
 
     public static byte[] scReduce32(byte[] a) {
diff --git a/core/src/test/java/knaccc/monero/address/CryptoUtilTest.java b/core/src/test/java/knaccc/monero/address/CryptoUtilTest.java
index 3622d9c3a0..637bce2824 100644
--- a/core/src/test/java/knaccc/monero/address/CryptoUtilTest.java
+++ b/core/src/test/java/knaccc/monero/address/CryptoUtilTest.java
@@ -20,6 +20,7 @@ package knaccc.monero.address;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 
 
 
@@ -31,5 +32,9 @@ public class CryptoUtilTest {
         String txKey = "6c336e52ed537676968ee319af6983c80b869ca6a732b5962c02748b486f8f0f";
         assertEquals(txKey, CryptoUtil.toCanonicalTxKey(txKey));
         assertEquals(txKey, CryptoUtil.toCanonicalTxKey(txKey.toUpperCase()));
+
+        // key with 1 above l value (created with HexEncoder.getString(ensure32BytesAndConvertToLittleEndian(l.add(BigInteger.ONE).toByteArray())))
+        txKey = "eed3f55c1a631258d69cf7a2def9de1400000000000000000000000000000010";
+        assertFalse(txKey.equals(CryptoUtil.toCanonicalTxKey(txKey)));
     }
 }