diff --git a/test/airdrop-test.js b/test/airdrop-test.js
index 841002bd..315435a9 100644
--- a/test/airdrop-test.js
+++ b/test/airdrop-test.js
@@ -14,7 +14,8 @@ const AirdropProof = require('../lib/primitives/airdropproof');
 const network = Network.get('regtest');
 
 const workers = new WorkerPool({
-  enabled: false
+  enabled: false,
+  size: 2
 });
 
 const AIRDROP_PROOF_FILE = resolve(__dirname, 'data', 'airdrop-proof.base64');
diff --git a/test/auction-reorg-test.js b/test/auction-reorg-test.js
index 2c9858c1..98016b66 100644
--- a/test/auction-reorg-test.js
+++ b/test/auction-reorg-test.js
@@ -20,7 +20,8 @@ const NAME2 = rules.grindName(10, 20, network);
 
 const workers = new WorkerPool({
   // Must be disabled for `ownership.ignore`.
-  enabled: false
+  enabled: false,
+  size: 2
 });
 
 function createNode() {
diff --git a/test/auction-test.js b/test/auction-test.js
index cd33abbe..a94e3ded 100644
--- a/test/auction-test.js
+++ b/test/auction-test.js
@@ -16,7 +16,8 @@ const NAME2 = rules.grindName(10, 20, network);
 
 const workers = new WorkerPool({
   // Must be disabled for `ownership.ignore`.
-  enabled: false
+  enabled: false,
+  size: 2
 });
 
 function createNode() {
diff --git a/test/chain-test.js b/test/chain-test.js
index 36afd56f..d6b45d1b 100644
--- a/test/chain-test.js
+++ b/test/chain-test.js
@@ -21,7 +21,8 @@ const opcodes = Script.opcodes;
 const network = Network.get('regtest');
 
 const workers = new WorkerPool({
-  enabled: true
+  enabled: true,
+  size: 2
 });
 
 const blocks = new BlockStore({
diff --git a/test/invalid-reorg-test.js b/test/invalid-reorg-test.js
index e7bb99cb..374f86b1 100644
--- a/test/invalid-reorg-test.js
+++ b/test/invalid-reorg-test.js
@@ -11,7 +11,8 @@ const Network = require('../lib/protocol/network');
 const network = Network.get('regtest');
 
 const workers = new WorkerPool({
-  enabled: true
+  enabled: true,
+  size: 2
 });
 
 describe('Invalid Reorg', function() {
diff --git a/test/mempool-test.js b/test/mempool-test.js
index 1025d71c..f0d86817 100644
--- a/test/mempool-test.js
+++ b/test/mempool-test.js
@@ -37,7 +37,8 @@ ONE_HASH[0] = 0x01;
 
 const network = Network.get('regtest');
 const workers = new WorkerPool({
-  enabled: true
+  enabled: true,
+  size: 2
 });
 
 const blocks = new BlockStore({
@@ -474,7 +475,8 @@ describe('Mempool', function() {
   describe('Mempool disconnect and reorg handling', function () {
     const workers = new WorkerPool({
       // Must be disabled for `ownership.ignore`.
-      enabled: false
+      enabled: false,
+      size: 2
     });
 
     const blocks = new BlockStore({
diff --git a/test/miner-test.js b/test/miner-test.js
index d7388f97..40afc8aa 100644
--- a/test/miner-test.js
+++ b/test/miner-test.js
@@ -13,7 +13,8 @@ const MemWallet = require('./util/memwallet');
 const {BufferSet} = require('buffer-map');
 
 const workers = new WorkerPool({
-  enabled: true
+  enabled: true,
+  size: 2
 });
 
 const blocks = new BlockStore({
diff --git a/test/wallet-auction-test.js b/test/wallet-auction-test.js
index e385a5dc..a0fe689e 100644
--- a/test/wallet-auction-test.js
+++ b/test/wallet-auction-test.js
@@ -20,7 +20,8 @@ const {
 } = network.names;
 
 const workers = new WorkerPool({
-  enabled: false
+  enabled: false,
+  size: 2
 });
 
 const blocks = new BlockStore({
diff --git a/test/wallet-test.js b/test/wallet-test.js
index 1f12fafc..7b79eb46 100644
--- a/test/wallet-test.js
+++ b/test/wallet-test.js
@@ -36,8 +36,9 @@ const KEY2 = 'xprv9s21ZrQH143K3mqiSThzPtWAabQ22Pjp3uSNnZ53A5bQ4udp'
   + 'faKekc2m4AChLYH1XDzANhrSdxHYWUeTWjYJwFwWFyHkTMnMeAcW4JyRCZa';
 
 const enabled = true;
+const size = 2;
 const network = Network.get('main');
-const workers = new WorkerPool({ enabled });
+const workers = new WorkerPool({ enabled, size });
 const wdb = new WalletDB({ network, workers });
 
 let currentWallet = null;
@@ -1854,7 +1855,7 @@ describe('Wallet', function() {
 
   describe('Disable TXs', function() {
     const network = Network.get('regtest');
-    const workers = new WorkerPool({ enabled });
+    const workers = new WorkerPool({ enabled, size });
     const wdb = new WalletDB({ network, workers });
 
     before(async () => {
@@ -1916,11 +1917,7 @@ describe('Wallet', function() {
     let wdb = null;
 
     beforeEach(async () => {
-      workers = new WorkerPool({
-        enabled: true,
-        size: 2
-      });
-
+      workers = new WorkerPool({ enabled, size });
       wdb = new WalletDB({ workers });
       await workers.open();
       await wdb.open();
@@ -1977,7 +1974,7 @@ describe('Wallet', function() {
 
   describe('TXDB locked balance', function() {
     const network = Network.get('regtest');
-    const workers = new WorkerPool({ enabled });
+    const workers = new WorkerPool({ enabled, size });
     const wdb = new WalletDB({ network, workers });
     // This test executes a complete auction for this name
     const name = 'satoshi';
@@ -2356,7 +2353,7 @@ describe('Wallet', function() {
 
   describe('TXDB locked balance after simulated rescan', function() {
     const network = Network.get('regtest');
-    const workers = new WorkerPool({ enabled });
+    const workers = new WorkerPool({ enabled, size });
     const wdb = new WalletDB({ network, workers });
     const name = 'satoshi';
     const nameHash = rules.hashName(name);
@@ -2760,7 +2757,7 @@ describe('Wallet', function() {
     // that later 'it' blocks depend on.
     let wallet, update;
     const network = Network.get('regtest');
-    const workers = new WorkerPool({enabled: false});
+    const workers = new WorkerPool({enabled: false, size});
     const wdb = new WalletDB({network, workers});
     // Cloudflare's "custom value" plus the standard "name value".
     // Verifiable with reserved-browser.js and names.json
@@ -2939,7 +2936,7 @@ describe('Wallet', function() {
 
   describe('Create auction-related TX in advance', function () {
     const network = Network.get('regtest');
-    const workers = new WorkerPool({ enabled });
+    const workers = new WorkerPool({ enabled, size });
     const wdb = new WalletDB({ network, workers });
     // This test executes a complete auction for this name
     const name = 'satoshi-in-advance';