diff --git a/appveyor.yml b/appveyor.yml
index 375e1e81..2877376a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,7 +5,9 @@ branches:
 image: Visual Studio 2019
 configuration:
 - Debug
-- DebugNoSTL
+- Debug - NoSTL
+- Debug MSVC - No STL - Built-ins
+- Debug MSVC - Force C++03
 clone_folder: c:\projects\etl
 install:
 - cmd: git submodule update --init --recursive