diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 382c56c7..73ffdaf7 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -2599,7 +2599,7 @@ Script.prototype.getCommitmentHash = function getCommitmentHash() {
 Script.prototype.isWitnessProgram = function isWitnessProgram() {
   // Witness programs are strict minimaldata.
   if (this.raw) {
-    if (!(this.raw.length >= 4 && this.raw.length <= 34))
+    if (!(this.raw.length >= 4 && this.raw.length <= 42))
       return false;
 
     if (this.raw[0] !== opcodes.OP_0
@@ -2624,7 +2624,7 @@ Script.prototype.isWitnessProgram = function isWitnessProgram() {
 
   return (this.code[0] === opcodes.OP_0
     || (this.code[0] >= opcodes.OP_1 && this.code[0] <= opcodes.OP_16))
-    && this.code[1].length >= 2 && this.code[1].length <= 32;
+    && this.code[1].length >= 2 && this.code[1].length <= 40;
 };
 
 /**