diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b0c9715e..bca27f7d3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -165,6 +165,7 @@ if(APPLE)
 endif()
 
 if(UNIX AND NOT APPLE)
+  target_link_libraries(osrm-prepare rt)
   target_link_libraries(osrm-datastore rt)
   target_link_libraries(OSRM rt)
 endif()