diff --git a/uppsrc/Core/Core.upp b/uppsrc/Core/Core.upp
index 6c6a17c1f..eb9889c23 100644
--- a/uppsrc/Core/Core.upp
+++ b/uppsrc/Core/Core.upp
@@ -9,9 +9,9 @@ library(MSC !MSC8ARM) "kernel32 user32";
 
 library(WIN32 !GUI !GNU !GCC) "ole32 oleaut32 oldnames";
 
-library(LINUX) "pthread dl";
+library(LINUX) "pthread dl rt";
 
-library(BSD) pthread;
+library(BSD) "pthread rt";
 
 library(WIN32 !MSC8ARM) "advapi32 shell32 winmm mpr";