diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e43e79a6e604fb296d59b37db77aba9b4b8c1f7..a4d843845ac9010ce03583a486744bf9db9df168 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@ pkg_check_modules(csm QUIET csm )
 link_directories(${csm_LIBRARY_DIRS})
 # keep only the files in a lib folder: by default the "." is in csm_LIBRARY_DIRS, 
 # which is not acceptable for target_link_directories 
-list(FILTER csm_LIBRARY_DIRS INCLUDE REGEX "/lib")
+list(FILTER ${csm_LIBRARY_DIRS} INCLUDE REGEX "/lib")
 
 
 #Build tests