diff --git a/editions/tw5.com/tiddlers/workingwithtw/TiddlyWiki Privacy and Security.tid b/editions/tw5.com/tiddlers/workingwithtw/TiddlyWiki Privacy and Security.tid
index 19ab1ca91..88e4d10a8 100644
--- a/editions/tw5.com/tiddlers/workingwithtw/TiddlyWiki Privacy and Security.tid	
+++ b/editions/tw5.com/tiddlers/workingwithtw/TiddlyWiki Privacy and Security.tid	
@@ -18,7 +18,7 @@ title: TiddlyWiki Privacy and Security
 
 The security and privacy implications of the two configurations are different:
 
-<div class="tc-flex-columns tc-flex-columns-2">
+<div class="tc-grid-columns tc-grid-columns-2">
 
 <div>