diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1fb65a4de..bae67bcb6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,6 +68,7 @@ cmake_dependent_option(ENABLE_NOTIFY "Enable libnotify support." YES "ENABLE_GTK
 cmake_dependent_option(ENABLE_ASSISTANT "Turn on assistant compiling." YES "ENABLE_GTK_UI" NO)
 
 set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_EXTENSIONS NO)
 
 if(NOT CMAKE_BUILD_TYPE)
 	set(CMAKE_BUILD_TYPE "Release")