diff --git a/CMakeLists.txt b/CMakeLists.txt
index 325cfac..d356b7f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,7 @@
 cmake_minimum_required(VERSION 3.10)
 project(crpc)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_program(Java_JAVA_EXECUTABLE NAMES java)
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
@@ -15,8 +17,6 @@ antlr4cpp_process_grammar(proto
         ${CMAKE_CURRENT_SOURCE_DIR}/src/grammar/ProtoParser.g4
 )
 
-set(CMAKE_CXX_STANDARD 17)
-
 FILE(GLOB_RECURSE SRC_LIST ${PROJECT_SOURCE_DIR}/src/*.cpp)
 add_executable(crpc
         ${SRC_LIST}
diff --git a/cmake/ExternalAntlr4Cpp.cmake b/cmake/ExternalAntlr4Cpp.cmake
index 4689ae1..dff681f 100644
--- a/cmake/ExternalAntlr4Cpp.cmake
+++ b/cmake/ExternalAntlr4Cpp.cmake
@@ -119,7 +119,7 @@ else()
             -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
             -DWITH_STATIC_CRT:BOOL=${ANTLR4_WITH_STATIC_CRT}
             -DDISABLE_WARNINGS:BOOL=ON
-            # -DCMAKE_CXX_STANDARD:STRING=17 # if desired, compile the runtime with a different C++ standard
+            -DCMAKE_CXX_STANDARD:STRING=17 # if desired, compile the runtime with a different C++ standard
             # -DCMAKE_CXX_STANDARD:STRING=${CMAKE_CXX_STANDARD} # alternatively, compile the runtime with the same C++ standard as the outer project
             INSTALL_COMMAND ""
             EXCLUDE_FROM_ALL 1)