diff --git a/src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java b/src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java
index e7c7f22..46425a3 100644
--- a/src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java
+++ b/src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java
@@ -303,8 +303,8 @@ public class Transaction extends ChildMessage {
         return length;
     }
 
-    public int getVirtualSize() {
-        return (int)Math.ceil((double)getWeightUnits() / (double)WITNESS_SCALE_FACTOR);
+    public double getVirtualSize() {
+        return (double)getWeightUnits() / (double)WITNESS_SCALE_FACTOR;
     }
 
     public int getWeightUnits() {
diff --git a/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java b/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
index d772166..17f3d06 100644
--- a/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
+++ b/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
@@ -489,7 +489,7 @@ public class Wallet {
                 transaction.addOutput(payment.getAmount(), payment.getAddress());
             }
 
-            int noChangeVSize = transaction.getVirtualSize();
+            double noChangeVSize = transaction.getVirtualSize();
             long noChangeFeeRequiredAmt = (fee == null ? (long)(feeRate * noChangeVSize) : fee);
 
             //Add 1 satoshi to accommodate longer signatures when feeRate equals default min relay fee to ensure fee is sufficient
@@ -528,7 +528,7 @@ public class Wallet {
                 //Change output is required, determine new fee once change output has been added
                 WalletNode changeNode = getFreshNode(KeyPurpose.CHANGE);
                 TransactionOutput changeOutput = new TransactionOutput(transaction, changeAmt, getOutputScript(changeNode));
-                int changeVSize = noChangeVSize + changeOutput.getLength();
+                double changeVSize = noChangeVSize + changeOutput.getLength();
                 long changeFeeRequiredAmt = (fee == null ? (long)(feeRate * changeVSize) : fee);
                 changeFeeRequiredAmt = (feeRate == Transaction.DEFAULT_MIN_RELAY_FEE ? changeFeeRequiredAmt + 1 : changeFeeRequiredAmt);