diff --git a/app/services/legacy-module-mappings.js b/app/services/legacy-module-mappings.js
index 9b535230..eac3522f 100644
--- a/app/services/legacy-module-mappings.js
+++ b/app/services/legacy-module-mappings.js
@@ -1,7 +1,8 @@
-import fetch from 'fetch';
 import Service from '@ember/service';
 import { tracked } from '@glimmer/tracking';
 
+import mappings from 'ember-rfc176-data/mappings.json';
+
 const LOCALNAME_CONVERSIONS = {
   Object: 'EmberObject',
   Array: 'EmberArray',
@@ -13,8 +14,6 @@ export default class LegacyModuleMappingsService extends Service {
 
   async initMappings() {
     try {
-      let response = await this.fetch();
-      let mappings = await response.json();
       let newMappings = this.buildMappings(mappings);
       this.mappings = newMappings;
     } catch (e) {
@@ -32,10 +31,6 @@ export default class LegacyModuleMappingsService extends Service {
     });
   }
 
-  fetch() {
-    return fetch('/assets/mappings.json');
-  }
-
   getModule(name, documentedModule) {
     if (!this.mappings) {
       return '';
diff --git a/ember-cli-build.js b/ember-cli-build.js
index 2b2f5ef9..251fa0e8 100644
--- a/ember-cli-build.js
+++ b/ember-cli-build.js
@@ -57,12 +57,6 @@ module.exports = function (defaults) {
     },
   });
 
-  let mappingsTree = new Funnel('node_modules/ember-rfc176-data/', {
-    srcDir: '/',
-    include: ['mappings.json'],
-    destDir: '/assets/',
-  });
-
   const { Webpack } = require('@embroider/webpack');
   const appTree = require('@embroider/compat').compatBuild(app, Webpack, {
     staticAddonTrees: true,
@@ -72,5 +66,5 @@ module.exports = function (defaults) {
     staticComponents: true,
   });
 
-  return mergeTrees([require('prember').prerender(app, appTree), mappingsTree]);
+  return mergeTrees(require('prember').prerender(app, appTree));
 };