diff --git a/server/core/Reader/BookConverter/ConvertFb3.js b/server/core/Reader/BookConverter/ConvertFb3.js
index 113240e8..0e1a4402 100644
--- a/server/core/Reader/BookConverter/ConvertFb3.js
+++ b/server/core/Reader/BookConverter/ConvertFb3.js
@@ -2,7 +2,7 @@ const fs = require('fs-extra');
 
 const ConvertHtml = require('./ConvertHtml');
 
-class ConvertDocX extends ConvertHtml {
+class ConvertFb3 extends ConvertHtml {
     async check(data, opts) {
         const {inputFiles} = opts;
         if (this.config.useExternalBookConverter && 
@@ -42,10 +42,11 @@ class ConvertDocX extends ConvertHtml {
         text = `<title>${title}</title>` + text
             .replace(/<title>/g, '<br><b>')
             .replace(/<\/title>/g, '</b><br>')
-            .replace(/<subtitle>/g, '<br><br><subtitle>')
+            .replace(/<subtitle>/g, '<br><br><fb2-subtitle>')
+            .replace(/<\/subtitle>/g, '</fb2-subtitle>')
         ;
         return await super.run(Buffer.from(text), {skipCheck: true, cutTitle: true});
     }
 }
 
-module.exports = ConvertDocX;
+module.exports = ConvertFb3;
diff --git a/server/core/Reader/BookConverter/ConvertHtml.js b/server/core/Reader/BookConverter/ConvertHtml.js
index 3c913cdc..4605a4aa 100644
--- a/server/core/Reader/BookConverter/ConvertHtml.js
+++ b/server/core/Reader/BookConverter/ConvertHtml.js
@@ -148,7 +148,7 @@ class ConvertHtml extends ConvertBase {
                     cutTitle = true;
             }
 
-            if (tag == 'subtitle') {
+            if (tag == 'fb2-subtitle') {
                 inSubTitle = true;
             }
 
@@ -184,7 +184,7 @@ class ConvertHtml extends ConvertBase {
             if (tag == 'title' || tag == 'cut-title')
                 inTitle = false;
 
-            if (tag == 'subtitle')
+            if (tag == 'fb2-subtitle')
                 inSubTitle = false;
 
             if (tag == 'fb2-image')
diff --git a/server/core/Reader/BookConverter/ConvertSites.js b/server/core/Reader/BookConverter/ConvertSites.js
index 5b9a608d..5074f3f8 100644
--- a/server/core/Reader/BookConverter/ConvertSites.js
+++ b/server/core/Reader/BookConverter/ConvertSites.js
@@ -95,12 +95,12 @@ class ConvertSites extends ConvertHtml {
         return text.substring(l, r)
             .replace(/blockquote class="?book"?/g, 'p')
             .replace(/<br\/?>\s*<\/h3>/g, '</h3>')
-            .replace(/<h3 class="?book"?>/g, '<br><br><subtitle>')
-            .replace(/<h5 class="?book"?>/g, '<br><br><subtitle>')
-            .replace(/<h3>/g, '<br><br><subtitle>')
-            .replace(/<h5>/g, '<br><br><subtitle>')
-            .replace(/<\/h3>/g, '</subtitle><br>')
-            .replace(/<\/h5>/g, '</subtitle><br>')
+            .replace(/<h3 class="?book"?>/g, '<br><br><fb2-subtitle>')
+            .replace(/<h5 class="?book"?>/g, '<br><br><fb2-subtitle>')
+            .replace(/<h3>/g, '<br><br><fb2-subtitle>')
+            .replace(/<h5>/g, '<br><br><fb2-subtitle>')
+            .replace(/<\/h3>/g, '</fb2-subtitle><br>')
+            .replace(/<\/h5>/g, '</fb2-subtitle><br>')
             .replace(/<div class="?stanza"?>/g, '<br>')
             .replace(/<div>/g, '<br>')
             + title;