diff --git a/src/ppd42ns/CMakeLists.txt b/src/ppd42ns/CMakeLists.txt
index b5fd8935..7cffed14 100644
--- a/src/ppd42ns/CMakeLists.txt
+++ b/src/ppd42ns/CMakeLists.txt
@@ -2,4 +2,4 @@ set (libname "ppd42ns")
 set (libdescription "upm ppd42ns dust sensor module")
 set (module_src ${libname}.cxx)
 set (module_h ${libname}.h)
-upm_module_init()
+upm_module_init("-lrt")