diff --git a/core/lib/presentation/extensions/html_extension.dart b/core/lib/presentation/extensions/html_extension.dart
index debe5daf4..c2195d224 100644
--- a/core/lib/presentation/extensions/html_extension.dart
+++ b/core/lib/presentation/extensions/html_extension.dart
@@ -2,7 +2,7 @@
 extension HtmlExtension on String {
 
   static const String editorStartTags = '<br><div><br></div>';
-  static const String signaturePrefix = '-- ';
+  static const String signaturePrefix = '--&nbsp;';
 
   String addBlockTag(String tag, {String? attribute}) =>
       attribute != null