diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0639e280..5486d77e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -60,7 +60,7 @@ IF (WIN32)
     SET(LIBS_SYSTEM ws2_32 crypt32 RpcRT4)
 ELSEIF (UNIX)
     IF(CMAKE_SYSTEM_NAME MATCHES "Linux")
-        SET(LIBS_SYSTEM c dl pthread anl)
+        SET(LIBS_SYSTEM c dl pthread anl rt)
         ADD_DEFINITIONS(-D_GNU_SOURCE -fvisibility=hidden)
     ELSEIF (CMAKE_SYSTEM_NAME MATCHES "Android")
         SET(LIBS_SYSTEM c dl)