diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9c9f78b9dd..ee8fd239c1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,6 +97,9 @@ endif()
 
 project(wxWidgets VERSION ${wxVERSION} LANGUAGES ${wxLANGUAGES})
 
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 include(build/cmake/main.cmake)
 
 # Set the default startup project for Visual Studio
diff --git a/build/tools/appveyor.bat b/build/tools/appveyor.bat
index ed8c6800e4..999d555708 100644
--- a/build/tools/appveyor.bat
+++ b/build/tools/appveyor.bat
@@ -65,7 +65,7 @@ goto :eof
 :cmake_qt
 set SKIPINSTALL=1
 set QT5DIR="C:\Qt\5.11\msvc2015_64"
-set CMAKE_CONFIGURE_FLAGS=-DCMAKE_PREFIX_PATH=%QT5DIR% -DwxBUILD_TOOLKIT="qt" -DCMAKE_CXX_STANDARD=11
+set CMAKE_CONFIGURE_FLAGS=-DCMAKE_PREFIX_PATH=%QT5DIR% -DwxBUILD_TOOLKIT="qt"
 goto cmake
 
 :cmake