diff --git a/lib/hexo/post.js b/lib/hexo/post.js
index 77a7780312..a1c356b481 100644
--- a/lib/hexo/post.js
+++ b/lib/hexo/post.js
@@ -93,6 +93,8 @@ class PostRenderEscape {
             swig_tag_name = '';
             swig_full_tag_start_buffer = '';
             swig_tag_name_begin = false; // Mark if it is the first non white space char in the swig tag
+          } else {
+            output += char;
           }
         } else {
           output += char;
diff --git a/test/scripts/hexo/post.js b/test/scripts/hexo/post.js
index 6bba9a6aae..c9fdbc6060 100644
--- a/test/scripts/hexo/post.js
+++ b/test/scripts/hexo/post.js
@@ -902,6 +902,28 @@ describe('Post', () => {
     ].join('\n'));
   });
 
+  it('render() - shouln\'t break curly brackets', async () => {
+    hexo.config.prismjs.enable = true;
+    hexo.config.highlight.enable = false;
+
+    const content = [
+      '\\begin{equation}',
+      'E=h\\nu',
+      '\\end{equation}'
+    ].join('\n');
+
+    const data = await post.render(null, {
+      content,
+      engine: 'markdown'
+    });
+
+    data.content.should.include('\\begin{equation}');
+    data.content.should.include('\\end{equation}');
+
+    hexo.config.prismjs.enable = false;
+    hexo.config.highlight.enable = true;
+  });
+
   // #2321
   it('render() - allow backtick code block in "blockquote" tag plugin', async () => {
     const code = 'alert("Hello world")';