diff --git a/unitree_legged_control/CMakeLists.txt b/unitree_legged_control/CMakeLists.txt
index 917bb91..5c27fd2 100644
--- a/unitree_legged_control/CMakeLists.txt
+++ b/unitree_legged_control/CMakeLists.txt
@@ -23,7 +23,7 @@ catkin_package(
 
 include_directories(include ${catkin_INCLUDE_DIRS} ${Boost_INCLUDE_DIR})
 
-link_directories($(catkin_LIB_DIRS) lib)
+link_directories(${catkin_LIB_DIRS} lib)
 
 add_library( unitree_legged_control 
     src/joint_controller.cpp