diff --git a/README.md b/README.md
index 599cb78..be80168 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,7 @@ This plugin takes an [import map](https://github.com/WICG/import-maps) as option
 | path    | `cwd/eik.json` | `string` | `false`  | Path to eik.json file.                                      |
 | urls    | `[]`           | `array`  | `false`  | Array of import map URLs to fetch from.                     |
 | maps    | `[]`           | `array`  | `false`  | Array of import map as objects.                             |
+| base    | ``             | `string` | `false`  | Base URL to be applied when parsing the import map.         |
 
 ## Note on the rollup external option
 
diff --git a/package.json b/package.json
index e823b42..0ea1f1e 100644
--- a/package.json
+++ b/package.json
@@ -58,6 +58,6 @@
   "dependencies": {
     "@eik/common": "3.0.1",
     "undici": "5.12.0",
-    "rollup-plugin-import-map": "3.0.0"
+    "rollup-plugin-import-map": "4.0.0-next.1"
   }
 }
diff --git a/src/plugin.js b/src/plugin.js
index 1d03bf1..caea10d 100644
--- a/src/plugin.js
+++ b/src/plugin.js
@@ -29,10 +29,11 @@ const fetchImportMaps = async (urls = []) => {
     }
 };
 
-export default function esmImportToUrl({
+export default function eikPlugin({
     path = process.cwd(),
     maps = [],
     urls = [],
+    base = '',
 } = {}) {
     const pMaps = Array.isArray(maps) ? maps : [maps];
     const pUrls = Array.isArray(urls) ? urls : [urls];
@@ -48,7 +49,9 @@ export default function esmImportToUrl({
             // Fetch import maps from the server
             const fetched = await fetchImportMaps([...config.map, ...pUrls]);
 
-            plugin = importMapPlugin([...fetched, ...pMaps]);
+            const pBase = (base === '') ? config.server : base;
+
+            plugin = importMapPlugin(pBase, [...fetched, ...pMaps]);
             await plugin.buildStart(options);
         },
 
diff --git a/test/plugin.js b/test/plugin.js
index da2c27b..53ded27 100644
--- a/test/plugin.js
+++ b/test/plugin.js
@@ -46,6 +46,7 @@ tap.test('plugin() - import map fetched from a URL', async (t) => {
                 },
             }],
             urls: [`${address}/one`, `${address}/two`],
+            base: 'https://cdn.eik.dev',
         })],
     };