diff --git a/packages/core-interfaces/src/core-transaction-pool/transaction-pool.ts b/packages/core-interfaces/src/core-transaction-pool/transaction-pool.ts
index ea97265696..072e1b2eaf 100644
--- a/packages/core-interfaces/src/core-transaction-pool/transaction-pool.ts
+++ b/packages/core-interfaces/src/core-transaction-pool/transaction-pool.ts
@@ -85,7 +85,7 @@ export interface ITransactionPool {
      * Get all transactions within the specified range [start, start + size), ordered by fee.
      * @return {(Array|void)} array of serialized transaction hex strings
      */
-    getTransactions(start: number, size: number, maxBytes: number): string[];
+    getTransactions(start: number, size: number, maxBytes?: number): string[];
 
     /**
      * Get all transactions within the specified range [start, start + size).
@@ -99,7 +99,7 @@ export interface ITransactionPool {
      * insertion time, if fees equal (earliest transaction first).
      * @return {Array} array of transaction[property]
      */
-    getTransactionsData(start: number, size: number, property: string, maxBytes: number): any[];
+    getTransactionsData(start: number, size: number, property: string, maxBytes?: number): any[];
 
     /**
      * Remove all transactions from the transaction pool belonging to specific sender.
diff --git a/packages/core-transaction-pool/src/connection.ts b/packages/core-transaction-pool/src/connection.ts
index 4433408025..4baa937702 100644
--- a/packages/core-transaction-pool/src/connection.ts
+++ b/packages/core-transaction-pool/src/connection.ts
@@ -242,7 +242,7 @@ export class TransactionPool implements transactionPool.ITransactionPool {
      * @param  {Number} maxBytes for the total transaction array or 0 for no limit
      * @return {(Array|void)} array of serialized transaction hex strings
      */
-    public getTransactions(start, size, maxBytes) {
+    public getTransactions(start, size, maxBytes?: number) {
         return this.getTransactionsData(start, size, "serialized", maxBytes);
     }
 
@@ -266,7 +266,7 @@ export class TransactionPool implements transactionPool.ITransactionPool {
      * @param  {String} property
      * @return {Array} array of transaction[property]
      */
-    public getTransactionsData(start, size, property, maxBytes) {
+    public getTransactionsData(start, size, property, maxBytes = 0) {
         this.__purgeExpired();
 
         const data = [];