diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index 4ae38da87..da5b2f492 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -1759,13 +1759,16 @@ class Mempool extends EventEmitter {
 
   getConflicts(tx) {
     const conflicts = [];
+    const hashes = new BufferSet();
 
     for (const {prevout} of tx.inputs) {
       const {hash, index} = prevout;
       const conflict = this.getSpent(hash, index);
 
-      if (conflict && conflicts.indexOf(conflict) === -1)
+      if (conflict && !hashes.has(hash)) {
+        hashes.add(hash);
         conflicts.push(conflict);
+      }
     }
 
     return conflicts;