diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1300c23..70e56fd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -125,6 +125,7 @@
 add_definitions (-DBOOST_BEAST_USE_STD_STRING_VIEW)
 add_definitions (-DBOOST_ERROR_CODE_HEADER_ONLY)
 add_definitions (-DBOOST_SYSTEM_NO_DEPRECATED)
+add_definitions (-DBOOST_ASIO_NO_DEPRECATED)
 add_definitions (-DBOOST_ALL_NO_LIB)
 add_definitions (-DBOOST_NO_RTTI)
 add_definitions (-DBOOST_NO_TYPEID)