diff --git a/CI/Windows.bat b/CI/Windows.bat
index a31edaaa..acb1e2d2 100644
--- a/CI/Windows.bat
+++ b/CI/Windows.bat
@@ -129,7 +129,7 @@ mkdir build-debug
 
 cd build-debug
 
-"C:\Program Files\CMake\bin\cmake.exe" -DGTEST_ROOT="%LIBPATH%\%ARCHITECTURE%\%GTESTVERSION%" -G "%GENERATOR%" -DOPENMESH_BUILD_UNIT_TESTS=TRUE  -DCMAKE_BUILD_TYPE=Debug -DOPENMESH_BUILD_SHARED=%SHARED% -DBUILD_APPS=%APPS% %CMAKE_CONFIGURATION% ..
+"C:\Program Files\CMake\bin\cmake.exe" -DGTEST_ROOT="%LIBPATH%\%ARCHITECTURE%\%GTESTVERSION%" -G "%GENERATOR%" -DOPENMESH_BUILD_UNIT_TESTS=TRUE -DEigen3_DIR="e:\libs\general\Eigen3.3.9\share\eigen3\cmake" -DCMAKE_BUILD_TYPE=Debug -DOPENMESH_BUILD_SHARED=%SHARED% -DBUILD_APPS=%APPS% %CMAKE_CONFIGURATION% ..
 
 %VS_PATH% /Build "Debug" OpenMesh.sln /Project "ALL_BUILD"