diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
index c197b62..876c226 100644
--- a/.github/workflows/linter.yml
+++ b/.github/workflows/linter.yml
@@ -12,9 +12,8 @@ jobs:
     - name: Install Dependencies
       run: npm install
     - run: npm run eslint
-    - run: npm test
     - name: Coverage
-      run: npm run test-cov
+      run: npx nyc --reporter=lcovonly npm test
       env:
         CI: true
     - name: Coveralls
diff --git a/layout/_partials/footer.njk b/layout/_partials/footer.njk
index c4534ab..94a85f0 100644
--- a/layout/_partials/footer.njk
+++ b/layout/_partials/footer.njk
@@ -77,7 +77,7 @@
 {%- if theme.footer.powered %}
   <div class="powered-by">
     {%- set next_site = 'https://theme-next.js.org' if theme.scheme === 'Gemini' else 'https://theme-next.js.org/' + theme.scheme | lower + '/' %}
-    {{- __('footer.powered', next_url('https://hexo.io', 'Hexo', {class: 'theme-link'}) + ' & ' + next_url(next_site, 'NexT.' + theme.scheme, {class: 'theme-link'})) }}
+    {{- __('footer.powered', next_url('https://hexo.io', 'Hexo') + ' & ' + next_url(next_site, 'NexT.' + theme.scheme)) }}
   </div>
 {%- endif %}
 
diff --git a/package.json b/package.json
index 013fe0f..a8bb877 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "prepare": "node .githooks/install.js",
     "stylint": "stylint source/css/",
     "test": "mocha test/index.js",
-    "test-cov": "nyc --reporter=lcovonly npm run test"
+    "test-cov": "nyc npm test"
   },
   "repository": "next-theme/hexo-theme-next",
   "keywords": [
diff --git a/scripts/helpers/next-url.js b/scripts/helpers/next-url.js
index 240459a..5f06921 100644
--- a/scripts/helpers/next-url.js
+++ b/scripts/helpers/next-url.js
@@ -36,10 +36,6 @@ module.exports = function(path, text, options = {}) {
     }
   }
 
-  if (attrs.class && Array.isArray(attrs.class)) {
-    attrs.class = attrs.class.join(' ');
-  }
-
   // If it's external link, rewrite attributes.
   if (data.protocol && data.hostname !== siteHost) {
     attrs.external = null;
diff --git a/test/helpers/next-url.js b/test/helpers/next-url.js
index a9fef70..20c4088 100644
--- a/test/helpers/next-url.js
+++ b/test/helpers/next-url.js
@@ -37,4 +37,10 @@ describe('next-url', () => {
     const encoded = btoa('https://theme-next.js.org');
     nextUrl('https://theme-next.js.org', 'Text').should.eql(`<span class="exturl" data-url="${encoded}">Text</span>`);
   });
+
+  it('class with exturl enabled', () => {
+    hexo.theme.exturl = true;
+    const encoded = btoa('https://theme-next.js.org');
+    nextUrl('https://theme-next.js.org', 'Text', { class: 'theme-link' }).should.eql(`<span class="exturl theme-link" data-url="${encoded}">Text</span>`);
+  });
 });