diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index d7e30e26..c7ea18b0 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -106,6 +106,7 @@ function Mempool(options) {
   this.rejectAbsurdFees = this.options.rejectAbsurdFees !== false;
   this.prematureWitness = !!this.options.prematureWitness;
   this.paranoid = !!this.options.paranoid;
+  this.replaceByFee = !!this.options.replaceByFee;
 
   this.maxSize = options.maxSize || constants.mempool.MAX_MEMPOOL_SIZE;
   this.expiryTime = options.expiryTime || constants.mempool.MEMPOOL_EXPIRY;
@@ -647,11 +648,13 @@ Mempool.prototype._addTX = co(function* _addTX(tx) {
         ret.reason,
         ret.score);
     }
-    if (tx.isRBF()) {
-      throw new VerifyError(tx,
-        'nonstandard',
-        'replace-by-fee',
-        0);
+    if (!this.replaceByFee) {
+      if (tx.isRBF()) {
+        throw new VerifyError(tx,
+          'nonstandard',
+          'replace-by-fee',
+          0);
+      }
     }
   }