diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index ea9d28c1..bcb3c7c9 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -115,7 +115,7 @@ var layout = {
   },
   ee: function ee(key) {
     return key.toString('hex', 1);
-  },
+  }
 };
 
 if (utils.isBrowser)
@@ -391,9 +391,9 @@ WalletDB.prototype.loadFilter = co(function* loadFilter() {
 });
 
 /**
- * Test the bloom filter against an array of address hashes.
+ * Test the bloom filter against a tx or address hash.
  * @private
- * @param {Hash[]} hashes
+ * @param {Hash} hash
  * @returns {Boolean}
  */
 
@@ -404,6 +404,19 @@ WalletDB.prototype.testFilter = function testFilter(hash) {
   return this.filter.test(hash, 'hex');
 };
 
+/**
+ * Add hash to filter.
+ * @private
+ * @param {Hash} hash
+ */
+
+WalletDB.prototype.addFilter = function addFilter(hash) {
+  if (!this.filter)
+    return;
+
+  return this.filter.add(hash, 'hex');
+};
+
 /**
  * Dump database (for debugging).
  * @returns {Promise} - Returns Object.
@@ -850,8 +863,7 @@ WalletDB.prototype.savePath = co(function* savePath(wallet, path) {
   var batch = this.batch(wallet);
   var wallets, result;
 
-  if (this.filter)
-    this.filter.add(hash, 'hex');
+  this.addFilter(hash);
 
   this.emit('path', path);
 
@@ -1448,7 +1460,7 @@ WalletDB.prototype._addBlock = co(function* addBlock(entry, txs) {
 
     hash = tx.hash('hex');
 
-    this.filter.add(hash, 'hex');
+    this.addFilter(hash);
 
     block.hashes.push(hash);
     matches.push(wallets);
@@ -1552,7 +1564,7 @@ WalletDB.prototype._addTX = co(function* addTX(tx) {
 
   yield this.db.put(layout.e(hash), serializeWallets(wallets));
 
-  this.filter.add(hash, 'hex');
+  this.addFilter(hash);
 
   return wallets;
 });