diff --git a/lib/mining/miner.js b/lib/mining/miner.js
index 2543efc7..74529cd4 100644
--- a/lib/mining/miner.js
+++ b/lib/mining/miner.js
@@ -469,6 +469,8 @@ Miner.prototype.build = function build(attempt) {
 
   assert(block.getWeight() <= attempt.weight,
     'Block exceeds reserved weight!');
+  assert(block.getBaseSize() <= consensus.MAX_BLOCK_SIZE,
+    'Block exceeds max block size.');
 };
 
 /**
@@ -566,12 +568,15 @@ MinerOptions.prototype.fromOptions = function fromOptions(options) {
 
   if (options.maxWeight != null) {
     assert(util.isNumber(options.maxWeight));
+    assert(options.maxWeight <= consensus.MAX_BLOCK_WEIGHT,
+      'Max weight must be below MAX_BLOCK_WEIGHT');
     this.maxWeight = options.maxWeight;
   }
 
   if (options.maxSigops != null) {
     assert(util.isNumber(options.maxSigops));
-    assert(options.maxSigops <= consensus.MAX_BLOCK_SIGOPS_COST);
+    assert(options.maxSigops <= consensus.MAX_BLOCK_SIGOPS_COST,
+      'Max sigops must be below MAX_BLOCK_SIGOPS_COST');
     this.maxSigops = options.maxSigops;
   }
 
diff --git a/lib/node/config.js b/lib/node/config.js
index 2457ca21..92d1810b 100644
--- a/lib/node/config.js
+++ b/lib/node/config.js
@@ -281,6 +281,7 @@ config.toOptions = function toOptions(data) {
   // Miner
   options.payoutAddress = list(data.payoutaddress);
   options.coinbaseFlags = str(data.coinbaseflags);
+  options.maxBlockWeight = num(data.maxblockweight);
 
   // HTTP
   options.sslCert = file(data.sslcert, prefix);
diff --git a/lib/node/fullnode.js b/lib/node/fullnode.js
index 814930bb..e6048f5b 100644
--- a/lib/node/fullnode.js
+++ b/lib/node/fullnode.js
@@ -119,7 +119,8 @@ function FullNode(options) {
     mempool: this.mempool,
     fees: this.fees,
     address: this.options.payoutAddress,
-    coinbaseFlags: this.options.coinbaseFlags
+    coinbaseFlags: this.options.coinbaseFlags,
+    maxWeight: this.options.maxBlockWeight
   });
 
   // Wallet database needs access to fees.