diff --git a/lib/middleware/template.js b/lib/middleware/template.js
index 6b361f05d1..3e226dcdc5 100644
--- a/lib/middleware/template.js
+++ b/lib/middleware/template.js
@@ -45,7 +45,8 @@ module.exports = async (ctx, next) => {
                     }
 
                     if (item.enclosure_length) {
-                        const itunes_duration = Math.floor(item.enclosure_length / 3600) + ':' + Math.floor((item.enclosure_length % 3600) / 60) + ':' + (((item.enclosure_length % 3600) % 60) / 100).toFixed(2).slice(-2);
+                        const itunes_duration =
+                            Math.floor(item.enclosure_length / 3600) + ':' + (Math.floor((item.enclosure_length % 3600) / 60) / 100).toFixed(2).slice(-2) + ':' + (((item.enclosure_length % 3600) % 60) / 100).toFixed(2).slice(-2);
                         item.itunes_duration = itunes_duration;
                     }
                 });
diff --git a/lib/routes/test/index.js b/lib/routes/test/index.js
index a118408c07..794bc681f2 100644
--- a/lib/routes/test/index.js
+++ b/lib/routes/test/index.js
@@ -49,6 +49,17 @@ module.exports = async (ctx) => {
         item = null;
     }
 
+    if (ctx.params.id === 'enclosure') {
+        item = [
+            {
+                title: '',
+                link: 'https://github.com/DIYgod/RSSHub/issues/1',
+                enclosure_url: 'https://github.com/DIYgod/RSSHub/issues/1',
+                enclosure_length: 3661,
+            },
+        ];
+    }
+
     if (ctx.query.mode === 'fulltext') {
         item = [
             {
@@ -60,6 +71,7 @@ module.exports = async (ctx) => {
 
     ctx.state.data = {
         title: `Test ${ctx.params.id}`,
+        itunes_author: ctx.params.id === 'enclosure' ? 'DIYgod' : null,
         link: 'https://github.com/DIYgod/RSSHub',
         item,
         allowEmpty: ctx.params.id === 'allow_empty',
diff --git a/lib/views/rss.art b/lib/views/rss.art
index 8b8475eba7..6307901a4a 100644
--- a/lib/views/rss.art
+++ b/lib/views/rss.art
@@ -32,7 +32,7 @@
             <link>{{ $value.link }}</link>
             {{ if $value.itunes_item_image }}<itunes:image href="{{ $value.itunes_item_image }}"/>{{ /if }}
             {{ if $value.enclosure_url }}<enclosure url="{{ $value.enclosure_url }}" {{ if $value.enclosure_length }}length="{{ $value.enclosure_length }}"{{ /if }} {{ if $value.enclosure_type }}type="{{ $value.enclosure_type }}"{{ /if }} />{{ /if }}
-            {{ if $value.itunes_duration }}<itunes:duration>{{ $value.itunes_duration }}</itunes:duration> {{ /if }}
+            {{ if itunes_author && $value.itunes_duration }}<itunes:duration>{{ $value.itunes_duration }}</itunes:duration> {{ /if }}
             {{ if $value.author }}<author><![CDATA[{{ $value.author }}]]></author>{{ /if }}
             {{ if typeof $value.category === 'string' }}
             <category>{{ $value.category }}</category>
diff --git a/test/middleware/template.js b/test/middleware/template.js
index 9d90c4f715..b93b37a7c1 100644
--- a/test/middleware/template.js
+++ b/test/middleware/template.js
@@ -68,4 +68,13 @@ describe('template', () => {
         const parsed = await parser.parseString(response.text);
         expect(parsed.items[0].title.length).toBe(103);
     });
+
+    it(`enclosure`, async () => {
+        const response = await request.get('/test/enclosure');
+        const parsed = await parser.parseString(response.text);
+        expect(parsed.itunes.author).toBe('DIYgod');
+        expect(parsed.items[0].enclosure.url).toBe('https://github.com/DIYgod/RSSHub/issues/1');
+        expect(parsed.items[0].enclosure.length).toBe('3661');
+        expect(parsed.items[0].itunes.duration).toBe('1:01:01');
+    });
 });