diff --git a/src/stepmotor/CMakeLists.txt b/src/stepmotor/CMakeLists.txt
index 1d506bba..666086b6 100644
--- a/src/stepmotor/CMakeLists.txt
+++ b/src/stepmotor/CMakeLists.txt
@@ -3,3 +3,4 @@ set (libdescription "upm STEPMOTOR")
 set (module_src ${libname}.cxx)
 set (module_h ${libname}.h)
 upm_module_init()
+target_link_libraries(${libname} rt)