diff --git a/CMakeLists.txt b/CMakeLists.txt
index a15e719..56a2d91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,6 +119,7 @@
 
 # add_definitions(-DBOOST_ASIO_ENABLE_HANDLER_TRACKING)
 add_definitions (-DBOOST_ASIO_DISABLE_THREADS)
+add_definitions (-DBOOST_BEAST_USE_STD_STRING_VIEW)
 add_definitions (-DBOOST_ERROR_CODE_HEADER_ONLY)
 add_definitions (-DBOOST_SYSTEM_NO_DEPRECATED)
 add_definitions (-DBOOST_ALL_NO_LIB)