diff --git a/build-support/macros-and-definitions.cmake b/build-support/macros-and-definitions.cmake
index c4afaf976..500f54d0e 100644
--- a/build-support/macros-and-definitions.cmake
+++ b/build-support/macros-and-definitions.cmake
@@ -229,6 +229,7 @@ unset(below_minimum_msg)
 set(CXX_UNSUPPORTED_STANDARDS 98 11 14)
 set(CMAKE_CXX_STANDARD_MINIMUM 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
 set(LIB_AS_NEEDED_PRE)
 set(LIB_AS_NEEDED_POST)
 set(STATIC_LINK_FLAGS -static -static-libstdc++ -static-libgcc)