diff --git a/src/registerShowdownExtension.js b/src/registerShowdownExtension.js
index 9d2cefd..7a20325 100644
--- a/src/registerShowdownExtension.js
+++ b/src/registerShowdownExtension.js
@@ -1,6 +1,6 @@
 const showdown = require('showdown')
 
-module.exports = function(name, extensionFunction) {
-  const customShowdownExtension = showdown.extension(name, extensionFunction)
+module.exports = function (name, extensionFunction) {
+  showdown.extension(name, extensionFunction)
   window.__ehtmlShowdownExtensions__.push(name)
 }