diff --git a/VirtualRobot/CMakeLists.txt b/VirtualRobot/CMakeLists.txt
index d80e1d767ec5ba4201ba0e1fe891a343fbb8df89..77ac7b23bd9af4afbdac1d34f844f19fb725aae7 100644
--- a/VirtualRobot/CMakeLists.txt
+++ b/VirtualRobot/CMakeLists.txt
@@ -267,16 +267,6 @@ if (Simox_USE_NLOPT AND NLOPT_FOUND)
     )
 endif ()
 
-if (Simox_USE_NLOPT AND NLOPT_FOUND)
-    SET(SOURCES ${SOURCES}
-        IK/ConstrainedOptimizationIK.cpp
-    )
-
-    SET(INCLUDES ${INCLUDES}
-        IK/ConstrainedOptimizationIK.h
-    )
-endif ()
-
 if (Simox_VISUALIZATION AND Simox_USE_COIN_VISUALIZATION)
 
     SET(SOURCES