diff --git a/lib/bcoin/workers.js b/lib/bcoin/workers.js
index b4700b5e..14405899 100644
--- a/lib/bcoin/workers.js
+++ b/lib/bcoin/workers.js
@@ -35,7 +35,7 @@ function Workers(options) {
   EventEmitter.call(this);
 
   this.uid = 0;
-  this.size = options.size || Workers.CORES;
+  this.size = Math.max(2, options.size || Workers.CORES);
   this.timeout = options.timeout || 60000;
   this.network = bcoin.network.get(options.network);
   this.children = [];
@@ -208,6 +208,7 @@ Workers.prototype.mine = function mine(attempt, callback) {
  * Represents a worker.
  * @exports Worker
  * @constructor
+ * @param {Workers} pool
  * @param {Number} id - Worker ID.
  * @property {Number} id
  */