diff --git a/source/RobotAPI/libraries/widgets/CMakeLists.txt b/source/RobotAPI/libraries/widgets/CMakeLists.txt
index 223e2489c1886a33f3be0ea509a251a131cf8b45..1b64636d881dffc647e0958140a32f17871a1cf0 100644
--- a/source/RobotAPI/libraries/widgets/CMakeLists.txt
+++ b/source/RobotAPI/libraries/widgets/CMakeLists.txt
@@ -8,13 +8,16 @@ find_package(SoQt REQUIRED)
 armarx_build_if(SOQT_FOUND "SoQt not available")
 find_package(jsoncpp QUIET)
 armarx_build_if(jsoncpp_FOUND "jsoncpp not available")
+find_package(Simox QUIET)
+armarx_build_if(Simox_FOUND "Simox-VirtualRobot not available")
 
 include(${QT_USE_FILE})
 include_directories(${Eigen3_INCLUDE_DIR})
 include_directories(
         ${Coin3D_INCLUDE_DIRS}
         ${SoQt_INCLUDE_DIRS}
-        ${jsoncpp_INCLUDE_DIR})
+        ${jsoncpp_INCLUDE_DIR}
+        ${Simox_INCLUDE_DIRS})
 
 
 set(LIB_NAME       RobotAPIWidgets)