diff --git a/CMakeLists.txt b/CMakeLists.txt
index eaa1781d7..ace97d09f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,10 @@ if (APPLE)
   enable_language(OBJC)
 endif()
 
+set(CMAKE_C_EXTENSIONS OFF)
+
 set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_EXTENSIONS OFF)
 
 set(CMAKE_PROJECT_VERSION_MAJOR 0)
 set(CMAKE_PROJECT_VERSION_MINOR 6)