diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index 6a8b107f..8bc94475 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -1078,7 +1078,7 @@ Chain.prototype._reset = co(function* reset(block, silent) {
 Chain.prototype.replay = co(function* replay(block) {
   var unlock = yield this.locker.lock();
   try {
-    return yield this._replay(block);
+    return yield this._replay(block, true);
   } finally {
     unlock();
   }
@@ -1089,10 +1089,11 @@ Chain.prototype.replay = co(function* replay(block) {
  * @method
  * @private
  * @param {Hash|Number} block - hash/height
+ * @param {Boolean?} silent
  * @returns {Promise}
  */
 
-Chain.prototype._replay = co(function* replay(block) {
+Chain.prototype._replay = co(function* replay(block, silent) {
   var entry = yield this.db.getEntry(block);
 
   if (!entry)
@@ -1102,9 +1103,37 @@ Chain.prototype._replay = co(function* replay(block) {
     throw new Error('Cannot reset on alternate chain.');
 
   if (entry.isGenesis())
-    return yield this._reset(entry.hash, true);
+    return yield this._reset(entry.hash, silent);
 
-  yield this._reset(entry.prevBlock, true);
+  yield this._reset(entry.prevBlock, silent);
+});
+
+/**
+ * Invalidate block.
+ * @method
+ * @param {Hash} hash
+ * @returns {Promise}
+ */
+
+Chain.prototype.invalidate = co(function* invalidate(hash) {
+  var unlock = yield this.locker.lock();
+  try {
+    return yield this._invalidate(hash);
+  } finally {
+    unlock();
+  }
+});
+
+/**
+ * Invalidate block (no lock).
+ * @method
+ * @param {Hash} hash
+ * @returns {Promise}
+ */
+
+Chain.prototype._invalidate = co(function* _invalidate(hash) {
+  yield this._replay(hash, false);
+  this.chain.setInvalid(hash);
 });
 
 /**
diff --git a/lib/http/rpc.js b/lib/http/rpc.js
index 7ef69368..73cab0ff 100644
--- a/lib/http/rpc.js
+++ b/lib/http/rpc.js
@@ -2020,7 +2020,7 @@ RPC.prototype.invalidateBlock = co(function* invalidateBlock(args, help) {
   if (!hash)
     throw new RPCError('Block not found.');
 
-  this.chain.setInvalid(hash);
+  yield this.chain.invalidate(hash);
 
   return null;
 });