diff --git a/CompletionEngine/Avalonia.Ide.CompletionEngine/AssemblyMetadata/MetadataConverter.cs b/CompletionEngine/Avalonia.Ide.CompletionEngine/AssemblyMetadata/MetadataConverter.cs
index 4fba9e31..24f7b8ad 100644
--- a/CompletionEngine/Avalonia.Ide.CompletionEngine/AssemblyMetadata/MetadataConverter.cs
+++ b/CompletionEngine/Avalonia.Ide.CompletionEngine/AssemblyMetadata/MetadataConverter.cs
@@ -611,6 +611,16 @@ private static void PreProcessTypes(Dictionary<string, MetadataType> types, Meta
                 IsXamlDirective = true,
                 Properties = { new MetadataProperty("", boolType,null, false, false, false, true)},
             },
+            new MetadataType("True")
+            {
+                HasSetProperties = true,
+                IsMarkupExtension = true,
+            },
+            new MetadataType("False")
+            {
+                HasSetProperties = true,
+                IsMarkupExtension = true,
+            },
         };
 
         //as in avalonia 0.9 Portablexaml is missing we need to hardcode some extensions