diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,7 @@
 
 add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0 -DQT_USE_QSTRINGBUILDER)
 
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 find_package(Qt5Multimedia QUIET)
diff --git a/plugins/platforms/x11/standalone/glxbackend.cpp b/plugins/platforms/x11/standalone/glxbackend.cpp
--- a/plugins/platforms/x11/standalone/glxbackend.cpp
+++ b/plugins/platforms/x11/standalone/glxbackend.cpp
@@ -69,17 +69,7 @@
 #endif
 
 #include <tuple>
-
-#if __cplusplus <= 201103L
-namespace std {
-    // C++-14
-    template<class T, class... Args>
-    unique_ptr<T> make_unique(Args&&... args) {
-        return unique_ptr<T>(new T(std::forward<Args>(args)...));
-    }
-}
-#endif
-
+#include <memory>
 
 namespace KWin
 {