diff --git a/libethereum/CMakeLists.txt b/libethereum/CMakeLists.txt
index 89b33a905..d8497471c 100644
--- a/libethereum/CMakeLists.txt
+++ b/libethereum/CMakeLists.txt
@@ -49,6 +49,7 @@ elseif (UNIX)
         target_link_libraries(ethereum ${Boost_DATE_TIME_LIBRARY})
         target_link_libraries(ethereum leveldb)
         target_link_libraries(ethereum snappy)
+        target_link_libraries(ethereum pthread)
 else ()
 	target_link_libraries(ethereum ${CRYPTOPP_LIBRARIES})
 	target_link_libraries(ethereum boost_system)