diff --git a/lib/mining/cpuminer.js b/lib/mining/cpuminer.js
index 6bb7cda5..3e39d2b5 100644
--- a/lib/mining/cpuminer.js
+++ b/lib/mining/cpuminer.js
@@ -547,7 +547,7 @@ CPUJob.prototype.getHashes = function getHashes(nonce) {
 CPUJob.prototype.getRate = function getRate(nonce) {
   const hashes = this.getHashes(nonce);
   const seconds = util.now() - this.start;
-  return Math.floor(hashes / seconds);
+  return Math.floor(hashes / Math.max(1, seconds));
 };
 
 /**