diff --git a/demo/markdownlint-browser.js b/demo/markdownlint-browser.js
index b0a93eb5..294c2b84 100644
--- a/demo/markdownlint-browser.js
+++ b/demo/markdownlint-browser.js
@@ -251,7 +251,7 @@ module.exports.filterTokens = filterTokens;
  * @returns {boolean} True iff token is a math block.
  */
 function isMathBlock(token) {
-    return ((token.tag === "math") &&
+    return (((token.tag === "$$") || (token.tag === "math")) &&
         token.type.startsWith("math_block") &&
         !token.type.endsWith("_end"));
 }
diff --git a/helpers/helpers.js b/helpers/helpers.js
index a1b10952..d13ae4b2 100644
--- a/helpers/helpers.js
+++ b/helpers/helpers.js
@@ -247,7 +247,7 @@ module.exports.filterTokens = filterTokens;
  */
 function isMathBlock(token) {
   return (
-    (token.tag === "math") &&
+    ((token.tag === "$$") || (token.tag === "math")) &&
     token.type.startsWith("math_block") &&
     !token.type.endsWith("_end")
   );