diff --git a/appveyor.yml b/appveyor.yml
index f1122d59..1832f28c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,9 +1,5 @@
 version: '{build}'
 
-configuration:
-  - Debug
-  - Release
-
 os: 
   - Visual Studio 2015
   - Visual Studio 2017
@@ -19,7 +15,7 @@ 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% -DCMAKE_CXX_FLAGS="${CMAKE_CXXFLAGS} %additional_flags%"
+  - cmake . -G%GEN% -DCMAKE_CXX_FLAGS="%additional_flags%"
   - cmake --build . --config Release
 
 test_script: