diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index c6c8e191..84e2a54b 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -2269,7 +2269,7 @@ CoinIndex.prototype.remove = function remove(hash, index) {
 
   assert(items);
   assert(items.has(key));
-  items.remove(key);
+  items.delete(key);
 
   if (items.size === 0)
     this.index.delete(addr);