diff --git a/cmake/Modules/AXConfigDefine.cmake b/cmake/Modules/AXConfigDefine.cmake
index dbc590671f..b539209f8f 100644
--- a/cmake/Modules/AXConfigDefine.cmake
+++ b/cmake/Modules/AXConfigDefine.cmake
@@ -77,7 +77,7 @@ endif()
 
 # config c++ standard
 if(NOT DEFINED CXX_STD)
-    set(CXX_STD 20)
+    set(CXX_STD 17)
 endif()
 message(STATUS "CXX_STD=${CXX_STD}")
 set(CMAKE_CXX_STANDARD ${CXX_STD})