diff --git a/etc/sample.conf b/etc/sample.conf
index 5dbf4b64..7e6679f5 100644
--- a/etc/sample.conf
+++ b/etc/sample.conf
@@ -42,6 +42,7 @@ index-address: false
 # Mempool
 #
 
+mempool-size: 100
 limit-free: true
 limit-free-relay: 15
 reject-absurd-fees: true
diff --git a/lib/node/config.js b/lib/node/config.js
index ed3e2c9a..2457ca21 100644
--- a/lib/node/config.js
+++ b/lib/node/config.js
@@ -250,6 +250,7 @@ config.toOptions = function toOptions(data) {
   options.indexAddress = bool(data.indexaddress);
 
   // Mempool
+  options.mempoolSize = mul(data.mempoolsize, 1000 * 1000);
   options.limitFree = bool(data.limitfree);
   options.limitFreeRelay = bool(data.limitfreerelay);
   options.requireStandard = bool(data.requirestandard);
diff --git a/lib/node/fullnode.js b/lib/node/fullnode.js
index 152d5114..3ba8b9cb 100644
--- a/lib/node/fullnode.js
+++ b/lib/node/fullnode.js
@@ -86,6 +86,7 @@ function FullNode(options) {
     logger: this.logger,
     chain: this.chain,
     fees: this.fees,
+    maxSize: this.options.mempoolSize,
     limitFree: this.options.limitFree,
     limitFreeRelay: this.options.limitFreeRelay,
     requireStandard: this.options.requireStandard,