diff --git a/lib/net/bip152.js b/lib/net/bip152.js
index 2b0cbd84..a1a2fe96 100644
--- a/lib/net/bip152.js
+++ b/lib/net/bip152.js
@@ -417,6 +417,13 @@ CompactBlock.prototype.init = function init() {
   if (this.totalTX > consensus.MAX_BLOCK_SIZE / 10)
     throw new Error('Compact block too big.');
 
+  // Custom limit to avoid hashdos:
+  // Min valid tx size: (4 + 1 + 41 + 1 + 9 + 4) = 60
+  // Min block header size: 81
+  // Max number of transactions: (1000000 - 81) / 60 = 16665
+  if (this.totalTX > (consensus.MAX_BLOCK_SIZE - 81) / 60)
+    throw new Error('Compact block too big.');
+
   // No sparse arrays here, v8.
   for (let i = 0; i < this.totalTX; i++)
     this.available.push(null);