diff --git a/appveyor.yml b/appveyor.yml
index fc410e45..0d85453e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,12 +1,21 @@
 version: '{build}'
+
+configuration:
+  - Debug
+  - Release
+
 os: 
-- Visual Studio 2015
-- Visual Studio 2017
+  - Visual Studio 2015
+  - Visual Studio 2017
+
 init: []
+
 install: []
+
 build_script:
-- IF "%APPVEYOR_BUILD_WORKER_IMAGE%" == "Visual Studio 2015" ( SET GEN="Visual Studio 14 2015") ELSE (SET GEN="Visual Studio 15 2017")
-- cmake . -G%GEN% 
-- cmake --build . --config Release
+  - IF "%APPVEYOR_BUILD_WORKER_IMAGE%" == "Visual Studio 2015" ( SET GEN="Visual Studio 14 2015") ELSE (SET GEN="Visual Studio 15 2017")
+  - cmake . -G%GEN% 
+  - cmake --build . --config Release
+
 test_script:
-- ctest -C Release -V
+  - ctest -C Release -V