diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 391effc..4348590 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,7 +17,7 @@ build windows/x64:
 test windows/x64:
   stage: test
   script:
-    - CMD.EXE /C build\libicsneo-tests.exe
+    - build\libicsneo-tests.exe
   dependencies:
     - build windows/x64
   needs:
diff --git a/ci/build-windows.bat b/ci/build-windows.bat
index 5871e98..1a4e614 100644
--- a/ci/build-windows.bat
+++ b/ci/build-windows.bat
@@ -6,6 +6,7 @@ mkdir build
 
 REM build
 cd build
+set CXXFLAGS=/WX
 cmake -GNinja -DCMAKE_BUILD_TYPE=RelWithDebInfo -DLIBICSNEO_BUILD_TESTS=ON ..
 if %errorlevel% neq 0 exit /b %errorlevel%
 cmake --build .