diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c3514c..77045b1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ project(SysYCompiler)
 
 cmake_minimum_required(VERSION 3.5)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 14)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -Wall -g -pedantic")
 
diff --git a/SysYF_Student/SysYF_Task2/CMakeLists.txt b/SysYF_Student/SysYF_Task2/CMakeLists.txt
index 0684ccc..aa543fb 100644
--- a/SysYF_Student/SysYF_Task2/CMakeLists.txt
+++ b/SysYF_Student/SysYF_Task2/CMakeLists.txt
@@ -2,7 +2,7 @@ project(SysYF_Task2)
 
 cmake_minimum_required(VERSION 3.5)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 14)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O0 -Wall -g -pedantic")