diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index 723b3f69..ec294ed4 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -239,9 +239,12 @@ Mempool.prototype._removeBlock = co(function* removeBlock(block) {
     if (this.hasTX(hash))
       continue;
 
+    tx = tx.clone();
+    tx.unsetBlock();
+
     entry = MempoolEntry.fromTX(tx, block.height);
 
-    yield this._addUnchecked(entry);
+    this.trackEntry(entry);
 
     this.emit('unconfirmed', tx, block);
   }