diff --git a/app/assets/javascripts/app/controllers/knowledge_base/reader_controller.coffee b/app/assets/javascripts/app/controllers/knowledge_base/reader_controller.coffee
index 388b91566..7897fee81 100644
--- a/app/assets/javascripts/app/controllers/knowledge_base/reader_controller.coffee
+++ b/app/assets/javascripts/app/controllers/knowledge_base/reader_controller.coffee
@@ -122,7 +122,7 @@ class App.KnowledgeBaseReaderController extends App.Controller
 
       return match unless url
 
-      "<div class='videoWrapper'><iframe id='#{settings.provider}#{settings.id}' type='text/html' src='#{url}' frameborder='0'></iframe></div>"
+      "<div class='videoWrapper'><iframe allowfullscreen id='#{settings.provider}#{settings.id}' type='text/html' src='#{url}' frameborder='0'></iframe></div>"
 
   renderAttachments: (attachments) ->
     @answerAttachments.html App.view('generic/attachments')(
diff --git a/app/helpers/knowledge_base_rich_text_helper.rb b/app/helpers/knowledge_base_rich_text_helper.rb
index 6aa8c8418..b9a00dd2b 100644
--- a/app/helpers/knowledge_base_rich_text_helper.rb
+++ b/app/helpers/knowledge_base_rich_text_helper.rb
@@ -44,7 +44,7 @@ module KnowledgeBaseRichTextHelper
 
       return match if !url
 
-      "<div class='videoWrapper'><iframe id='#{settings[:provider]}#{settings[:id]}' type='text/html' src='#{url}' frameborder='0'></iframe></div>"
+      "<div class='videoWrapper'><iframe allowfullscreen id='#{settings[:provider]}#{settings[:id]}' type='text/html' src='#{url}' frameborder='0'></iframe></div>"
     end
   end
 end