diff --git a/CMakeLists.txt b/CMakeLists.txt
index da0f3549377a772b67e8a6500e5927b7416fa83c..dc85f683c112e6ec1b5264671c0b6a58a42a31f7 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,9 +3,9 @@ if (ENABLE_OPEN_SRC)
     cmake_minimum_required(VERSION 3.14)
     project(TFAdapter)
 
-    set(CMAKE_CXX_STANDARD 17)
+    set(CMAKE_CXX_STANDARD 11)
     set(CMAKE_C_FLAGS "-O2 -Wall -fPIC -fstack-protector-all -Wl,-z,relro,-z,now,-z,noexecstack -pipe ${CMAKE_C_FLAGS}")
-    set(CMAKE_CXX_FLAGS "-std=c++17 -O2 -Wall -fPIC -fstack-protector-all -Wl,-z,relro,-z,now,-z,noexecstack -pipe ${CMAKE_CXX_FLAGS}")
+    set(CMAKE_CXX_FLAGS "-std=c++11 -O2 -Wall -fPIC -fstack-protector-all -Wl,-z,relro,-z,now,-z,noexecstack -pipe ${CMAKE_CXX_FLAGS}")
     # build external prjects
     if(DEFINED ENV{D_PKG_SERVER})
         set(TF_PKG_SERVER $ENV{D_PKG_SERVER})