diff --git a/client/CMakeLists.txt b/client/CMakeLists.txt
index 65e7f735..07eb7876 100644
--- a/client/CMakeLists.txt
+++ b/client/CMakeLists.txt
@@ -30,6 +30,7 @@ find_package(GMP)
 
 add_definitions(-D BUILD_VERSION='"${BUILD_VERSION}"')
 add_definitions(-D USE_NETTLE)
+add_definitions(-D ATOMIC_LOCKING)
 
 include_directories(
 	${PROJECT_SOURCE_DIR}