diff --git a/appveyor.yml b/appveyor.yml
index 1336989..3cd8ced 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -20,7 +20,8 @@ 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="%additional_flags%"
+  - mkdir -p build && cd build
+  - cmake .. -G%GEN% -DCMAKE_CXX_FLAGS="%additional_flags%"
   - cmake --build . --config Release
 
 test_script: