diff --git a/ghost/admin/lib/asset-delivery/index.js b/ghost/admin/lib/asset-delivery/index.js
index 09f3422925..54b3ccb2e7 100644
--- a/ghost/admin/lib/asset-delivery/index.js
+++ b/ghost/admin/lib/asset-delivery/index.js
@@ -63,11 +63,20 @@ module.exports = {
         // copy the index.html file
         fs.copySync(`${results.directory}/index.html`, `${assetsOut}/index.html`, {overwrite: true, dereference: true});
 
-        // copy all the `/assets` files, except the `icons` folder
+        // get all the `/assets` files, except the `icons` folder
         const assets = walkSync(results.directory + '/assets', {
             ignore: ['icons']
         });
 
+        // loop over any sourcemaps and add a "sourceRoot" key to each one before copying
+        assets.filter((file) => file.endsWith('.map')).forEach((file) => {
+            const mapFilePath = `${results.directory}/assets/${file}`;
+            const mapFile = JSON.parse(fs.readFileSync(mapFilePath, 'utf8'));
+            mapFile.sourceRoot = '../';
+            fs.writeFileSync(mapFilePath, JSON.stringify(mapFile));
+        });
+
+        // copy the assets to assetsOut
         assets.forEach(function (relativePath) {
             if (relativePath.slice(-1) === '/') { return; }
 
diff --git a/ghost/admin/lib/sourcemap-postprocess/index.js b/ghost/admin/lib/sourcemap-postprocess/index.js
deleted file mode 100644
index d2c2d8ceca..0000000000
--- a/ghost/admin/lib/sourcemap-postprocess/index.js
+++ /dev/null
@@ -1,30 +0,0 @@
-/* eslint-disable */
-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-
-module.exports = {
-    name: 'sourcemap-postprocess',
-
-    isDevelopingAddon() {
-        return true;
-    },
-
-    postBuild: function (results) {
-        // read all .map files in the /assets directory
-        const assets = fs.readdirSync(path.join(results.directory, 'assets'));
-        const mapFiles = assets.filter((file) => file.endsWith('.map'));
-
-        // loop over the mapfiles and add a "sourceRoot" key to each one
-        mapFiles.forEach((file) => {
-            const mapFilePath = path.join(results.directory, 'assets', file);
-            const mapFile = JSON.parse(fs.readFileSync(mapFilePath, 'utf8'));
-            const sources = mapFile.sources;
-            for (let i = 0; i < sources.length; i++) {
-                sources[i] = sources[i].replace('assets/', '');
-            }
-            fs.writeFileSync(mapFilePath, JSON.stringify(mapFile));
-        });
-    }
-};
diff --git a/ghost/admin/lib/sourcemap-postprocess/package.json b/ghost/admin/lib/sourcemap-postprocess/package.json
deleted file mode 100644
index 1c4c13d860..0000000000
--- a/ghost/admin/lib/sourcemap-postprocess/package.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "name": "sourcemap-postprocess",
-  "keywords": [
-    "ember-addon"
-  ]
-}
diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index ea187f4ded..b43c5f2d37 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -151,8 +151,7 @@
     "paths": [
       "lib/asset-delivery",
       "lib/ember-power-calendar-moment",
-      "lib/ember-power-calendar-utils",
-      "lib/sourcemap-postprocess"
+      "lib/ember-power-calendar-utils"
     ]
   },
   "resolutions": {