diff --git a/QuestPDF/Assembly.cs b/QuestPDF/Assembly.cs
index cd1c024..6d8b210 100644
--- a/QuestPDF/Assembly.cs
+++ b/QuestPDF/Assembly.cs
@@ -1,6 +1,7 @@
 using System.Runtime.CompilerServices;
 
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]
+[assembly: InternalsVisibleTo("QuestPDF.Previewer")]
 [assembly: InternalsVisibleTo("QuestPDF.UnitTests")]
 [assembly: InternalsVisibleTo("QuestPDF.Examples")]
 [assembly: InternalsVisibleTo("QuestPDF.ReportSample")]
\ No newline at end of file