diff --git a/web3.js/module.flow.js b/web3.js/module.flow.js
index 5e9625800a..876040b976 100644
--- a/web3.js/module.flow.js
+++ b/web3.js/module.flow.js
@@ -223,6 +223,7 @@ declare module '@solana/web3.js' {
     static createAccountWithSeed(
       from: PublicKey,
       newAccount: PublicKey,
+      base: PublicKey,
       seed: string,
       lamports: number,
       space: number,
diff --git a/web3.js/package-lock.json b/web3.js/package-lock.json
index 1413be7c0f..a127166e0f 100644
--- a/web3.js/package-lock.json
+++ b/web3.js/package-lock.json
@@ -9720,8 +9720,7 @@
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/hoek/-/hoek-4.2.1.tgz",
       "integrity": "sha512-QLg82fGkfnJ/4iy1xZ81/9SIJiq1NGFUMGs6ParyjBZr6jW2Ufj/snDqTHixNlHdPNwN2RLVD0Pi3igeK9+JfA==",
-      "dev": true,
-      "optional": true
+      "dev": true
     },
     "hook-std": {
       "version": "2.0.0",
@@ -9859,8 +9858,7 @@
           "version": "2.7.0",
           "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
           "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc=",
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "acorn-globals": {
           "version": "1.0.9",
diff --git a/web3.js/src/system-program.js b/web3.js/src/system-program.js
index fad0fcdd2c..03366f44ea 100644
--- a/web3.js/src/system-program.js
+++ b/web3.js/src/system-program.js
@@ -148,6 +148,7 @@ const SystemInstructionLayout = Object.freeze({
     index: 3,
     layout: BufferLayout.struct([
       BufferLayout.u32('instruction'),
+      Layout.publicKey('base'),
       Layout.rustString('seed'),
       BufferLayout.ns64('lamports'),
       BufferLayout.ns64('space'),
@@ -246,6 +247,7 @@ export class SystemProgram {
   static createAccountWithSeed(
     from: PublicKey,
     newAccount: PublicKey,
+    base: PublicKey,
     seed: string,
     lamports: number,
     space: number,
@@ -253,6 +255,7 @@ export class SystemProgram {
   ): Transaction {
     const type = SystemInstructionLayout.CreateWithSeed;
     const data = encodeData(type, {
+      base: base.toBuffer(),
       seed,
       lamports,
       space,
diff --git a/web3.js/test/system-program.test.js b/web3.js/test/system-program.test.js
index c690b68782..3798707e66 100644
--- a/web3.js/test/system-program.test.js
+++ b/web3.js/test/system-program.test.js
@@ -58,6 +58,7 @@ test('createAccountWithSeed', () => {
   transaction = SystemProgram.createAccountWithSeed(
     from.publicKey,
     newAccount.publicKey,
+    from.publicKey,
     'hi there',
     123,
     BudgetProgram.space,
@@ -133,6 +134,7 @@ test('SystemInstruction createWithSeed', () => {
   const create = SystemProgram.createAccountWithSeed(
     from.publicKey,
     to.publicKey,
+    from.publicKey,
     'hi there',
     amount,
     space,