diff --git a/CMakeLists.txt b/CMakeLists.txt
index 97e68fb77c..9638583e93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,9 +92,10 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build." FORCE)
 endif()
 
-# Force C++11 and C99
+# Force C++11 (No extensions) and C99
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED True)
+set(CMAKE_CXX_EXTENSIONS OFF)
 if(NOT MSVC)
   set(CMAKE_C_STANDARD 99)
   set(CMAKE_C_STANDARD_REQUIRED True)