diff --git a/src/index.html b/src/index.html
index 8a8bd75..529bccc 100644
--- a/src/index.html
+++ b/src/index.html
@@ -157,7 +157,7 @@
                                         <select class="mnemonic-length form-control">
                                             <option value="raw">From entropy length (3 words per 32 bits)</option>
                                             <option value="12">12 Words</option>
-                                            <option value="15">15 Words</option>
+                                            <option value="15" selected>15 Words</option>
                                             <option value="18">18 Words</option>
                                             <option value="21">21 Words</option>
                                             <option value="24">24 Words</option>
diff --git a/tests.js b/tests.js
index 0ce34bd..b0e7ef8 100644
--- a/tests.js
+++ b/tests.js
@@ -2237,6 +2237,7 @@ page.open(url, function(status) {
     // use entropy
     page.evaluate(function() {
         $(".use-entropy").prop("checked", true).trigger("change");
+        $(".mnemonic-length").val("raw");
         $(".entropy").val("00000000 00000000 00000000 00000000").trigger("input");
     });
     // check the mnemonic is set and address is correct
@@ -2858,6 +2859,7 @@ page.open(url, function(status) {
     // use entropy
     page.evaluate(function() {
         $(".use-entropy").prop("checked", true).trigger("change");
+        $(".mnemonic-length").val("raw");
     });
     var nextTest = function runNextTest(i) {
         function getFeedbackError(expected, actual) {
@@ -2934,6 +2936,7 @@ page.open(url, function(status) {
     // use entropy
     page.evaluate(function() {
         $(".use-entropy").prop("checked", true).trigger("change");
+        $(".mnemonic-length").val("raw");
         var entropy  = "00000000 00000000 00000000 00000000";
             entropy += "11111111 11111111 11111111 1111"; // Missing last byte
         $(".entropy").val(entropy).trigger("input");
@@ -2960,6 +2963,7 @@ page.open(url, function(status) {
     // use entropy
     page.evaluate(function() {
         $(".use-entropy").prop("checked", true).trigger("change");
+        $(".mnemonic-length").val("raw");
         var entropy  = "";
         // Generate a very long entropy string
         for (var i=0; i<33; i++) {
@@ -2993,6 +2997,7 @@ page.open(url, function(status) {
     // use entropy
     page.evaluate(function() {
         $(".use-entropy").prop("checked", true).trigger("change");
+        $(".mnemonic-length").val("raw");
         var entropy  = "543210543210543210543210543210543210543210543210543210543210543210543210543210543210543210543210543";
         $(".entropy").val(entropy).trigger("input");
     });