diff --git a/lib/markdown-it/markdown-it-radio-button.js b/lib/markdown-it/markdown-it-radio-button.js
index 8ef268a68f..629dea8aac 100644
--- a/lib/markdown-it/markdown-it-radio-button.js
+++ b/lib/markdown-it/markdown-it-radio-button.js
@@ -1,3 +1,5 @@
+const crypto = require('crypto');
+
 var disableRadio = false;
 var useLabelWrapper = true;
 
@@ -18,7 +20,10 @@ module.exports = function(md, options) {
         if (group) {
           group = group[1];
         } else {
-          group = Math.random().toString(36).substr(2, 5); // generate a new group id
+          group = crypto.createHash('md5')
+                        .update(tokens[i-5].content)
+                        .update(tokens[i-4].content)
+                        .update(tokens[i].content).digest('hex').substr(2, 5); // generate a deterministic group id
         }
         radioify(tokens[i], state.Token, group);
         attrSet(tokens[i-2], 'class', 'radio-list-item');
@@ -110,4 +115,4 @@ function isListItem(token) { return token.type === 'list_item_open'; }
 function startsWithTodoMarkdown(token) {
   // leading whitespace in a list item is already trimmed off by markdown-it
   return token.content.indexOf('( ) ') === 0 || token.content.indexOf('(x) ') === 0 || token.content.indexOf('(X) ') === 0;
-}
\ No newline at end of file
+}