diff --git a/app/assets/javascripts/app/lib/app_post/utils.coffee b/app/assets/javascripts/app/lib/app_post/utils.coffee
index 956889672..fd9b23bef 100644
--- a/app/assets/javascripts/app/lib/app_post/utils.coffee
+++ b/app/assets/javascripts/app/lib/app_post/utils.coffee
@@ -681,7 +681,8 @@ class App.Utils
     $('<div/>').html(message).contents().each (index, node) ->
       text = $(node).text()
       if node.nodeType == Node.TEXT_NODE
-        res.push text
+        # convert text back to HTML as it was before
+        res.push $('<div>').text(text).html()
         if text.trim().length
           contentNodes.push index
       else if node.nodeType == Node.ELEMENT_NODE
diff --git a/public/assets/tests/html_utils.js b/public/assets/tests/html_utils.js
index 37234a117..d208dd8cc 100644
--- a/public/assets/tests/html_utils.js
+++ b/public/assets/tests/html_utils.js
@@ -3367,3 +3367,8 @@ test('App.Utils.clipboardHtmlInsertPreperation()', function() {
   equal(App.Utils.clipboardHtmlInsertPreperation('<div><b>test</b><br> 123</div>', { mode: 'textonly', multiline: true }), 'test<br> 123')
 });
 
+test('App.Utils.signatureIdentifyByHtmlHelper()', function() {
+  result = App.Utils.signatureIdentifyByHtmlHelper("&lt;script&gt;alert('fish2');&lt;/script&gt;<blockquote></blockquote>")
+
+  equal(result, "&lt;script&gt;alert('fish2');&lt;/script&gt;<span class=\"js-signatureMarker\"></span><blockquote></blockquote>", 'signatureIdentifyByHtmlHelper does not reactivate alert')
+});