diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0dc4d6a..f1e67f9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -216,7 +216,7 @@ target_include_directories(fc
 target_link_libraries( fc PUBLIC easylzma_static ${Boost_LIBRARIES} ${OPENSSL_LIBRARIES} ${ZLIB_LIBRARIES} ${CMAKE_DL_LIBS})
 
 add_executable( ntp_test ntp_test.cpp )
-target_link_libraries( ntp_test fc )
+target_link_libraries( ntp_test fc ${rt_library} )
 
 #add_executable( test_compress tests/compress.cpp )
 #target_link_libraries( test_compress fc )