diff --git a/CI/Windows.bat b/CI/Windows.bat
index 616dcf27..a31edaaa 100644
--- a/CI/Windows.bat
+++ b/CI/Windows.bat
@@ -107,7 +107,7 @@ IF EXIST %QT_INSTALL_PATH%\ (
 )
 
 
-"C:\Program Files\CMake\bin\cmake.exe" -DGTEST_ROOT="%LIBPATH%\%ARCHITECTURE%\%GTESTVERSION%" -G "%GENERATOR%"  -DCMAKE_BUILD_TYPE=Release -DBUILD_APPS=%APPS% -DOPENMESH_BUILD_UNIT_TESTS=TRUE -DCMAKE_WINDOWS_LIBS_DIR="e:\libs" -DOPENMESH_BUILD_SHARED=%SHARED% %CMAKE_CONFIGURATION% ..
+"C:\Program Files\CMake\bin\cmake.exe" -DGTEST_ROOT="%LIBPATH%\%ARCHITECTURE%\%GTESTVERSION%" -G "%GENERATOR%"  -DCMAKE_BUILD_TYPE=Release -DBUILD_APPS=%APPS% -DOPENMESH_BUILD_UNIT_TESTS=TRUE -DCMAKE_WINDOWS_LIBS_DIR="e:\libs" -DEigen3_DIR="e:\libs\general\Eigen3.3.9\share\eigen3\cmake"  -DOPENMESH_BUILD_SHARED=%SHARED% %CMAKE_CONFIGURATION% ..
 
 %VS_PATH% /Build "Release" OpenMesh.sln /Project "ALL_BUILD"