diff --git a/browser/components/MarkdownEditor.js b/browser/components/MarkdownEditor.js
index 280fbced..89f7746c 100644
--- a/browser/components/MarkdownEditor.js
+++ b/browser/components/MarkdownEditor.js
@@ -304,6 +304,7 @@ class MarkdownEditor extends React.Component {
           noteKey={noteKey}
           customCSS={config.preview.customCSS}
           allowCustomCSS={config.preview.allowCustomCSS}
+          lineThroughCheckbox={config.preview.lineThroughCheckbox}
         />
       </div>
     )
diff --git a/browser/components/MarkdownPreview.js b/browser/components/MarkdownPreview.js
index ed30ede9..bef6a976 100755
--- a/browser/components/MarkdownPreview.js
+++ b/browser/components/MarkdownPreview.js
@@ -490,10 +490,6 @@ export default class MarkdownPreview extends React.Component {
     eventEmitter.on('export:save-md', this.saveAsMdHandler)
     eventEmitter.on('export:save-html', this.saveAsHtmlHandler)
     eventEmitter.on('print', this.printHandler)
-    eventEmitter.on('config-renew', () => {
-      this.markdown.updateConfig()
-      this.rewriteIframe()
-    })
   }
 
   componentWillUnmount () {
@@ -537,7 +533,8 @@ export default class MarkdownPreview extends React.Component {
       prevProps.smartQuotes !== this.props.smartQuotes ||
       prevProps.sanitize !== this.props.sanitize ||
       prevProps.smartArrows !== this.props.smartArrows ||
-      prevProps.breaks !== this.props.breaks
+      prevProps.breaks !== this.props.breaks ||
+      prevProps.lineThroughCheckbox !== this.props.lineThroughCheckbox
     ) {
       this.initMarkdown()
       this.rewriteIframe()
diff --git a/browser/components/MarkdownSplitEditor.js b/browser/components/MarkdownSplitEditor.js
index 73cac7ad..7d01e3b5 100644
--- a/browser/components/MarkdownSplitEditor.js
+++ b/browser/components/MarkdownSplitEditor.js
@@ -196,6 +196,7 @@ class MarkdownSplitEditor extends React.Component {
           noteKey={noteKey}
           customCSS={config.preview.customCSS}
           allowCustomCSS={config.preview.allowCustomCSS}
+          lineThroughCheckbox={config.preview.lineThroughCheckbox}
        />
       </div>
     )
diff --git a/browser/lib/markdown.js b/browser/lib/markdown.js
index 248dbb4b..49260740 100644
--- a/browser/lib/markdown.js
+++ b/browser/lib/markdown.js
@@ -21,7 +21,7 @@ function createGutter (str, firstLineNumber) {
 
 class Markdown {
   constructor (options = {}) {
-    let config = ConfigManager.get()
+    const config = ConfigManager.get()
     const defaultOptions = {
       typographer: config.preview.smartQuotes,
       linkify: true,
@@ -265,9 +265,6 @@ class Markdown {
     }
     // FIXME We should not depend on global variable.
     window.md = this.md
-    this.updateConfig = () => {
-      config = ConfigManager.get()
-    }
   }
 
   render (content) {