diff --git a/src/Avalonia.Controls/AppBuilder.cs b/src/Avalonia.Controls/AppBuilder.cs
index 77cc9d4dcb..1cac22c8ce 100644
--- a/src/Avalonia.Controls/AppBuilder.cs
+++ b/src/Avalonia.Controls/AppBuilder.cs
@@ -151,7 +151,7 @@ namespace Avalonia
             }
 
             throw new InvalidOperationException(
-                $"Unable to create AppBuilder from type {entryPointType.Name}." +
+                $"Unable to create AppBuilder from type \"{entryPointType.FullName}\". " +
                 $"Input type either needs to have BuildAvaloniaApp -> AppBuilder method or inherit Application type.");
         }