diff --git a/assets/javascripts/lib/discourse-markdown/discourse-math.js.es6 b/assets/javascripts/lib/discourse-markdown/discourse-math.js.es6
index 592fcd4..395267b 100644
--- a/assets/javascripts/lib/discourse-markdown/discourse-math.js.es6
+++ b/assets/javascripts/lib/discourse-markdown/discourse-math.js.es6
@@ -164,19 +164,20 @@ export function setup(helper) {
     return;
   }
 
-  let enable_asciimath;
   helper.registerOptions((opts, siteSettings) => {
     opts.features.math = siteSettings.discourse_math_enabled;
-    enable_asciimath = siteSettings.discourse_math_enable_asciimath;
+    opts.features.asciimath = siteSettings.discourse_math_enable_asciimath;
   });
 
   helper.registerPlugin((md) => {
-    if (enable_asciimath) {
-      md.inline.ruler.after("escape", "asciimath", asciiMath);
+    if (md.options.discourse.features.math) {
+      if (md.options.discourse.features.asciimath) {
+        md.inline.ruler.after("escape", "asciimath", asciiMath);
+      }
+      md.inline.ruler.after("escape", "math", inlineMath);
+      md.block.ruler.after("code", "math", blockMath, {
+        alt: ["paragraph", "reference", "blockquote", "list"],
+      });
     }
-    md.inline.ruler.after("escape", "math", inlineMath);
-    md.block.ruler.after("code", "math", blockMath, {
-      alt: ["paragraph", "reference", "blockquote", "list"],
-    });
   });
 }