diff --git a/CMakeLists.txt b/CMakeLists.txt
index debac47e5..b8059acba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,9 @@ option(BUILD_UTILITY_PGSQL2SQLITE "builds the utility program pgsql2sqlite" ON)
 option(BUILD_UTILITY_SHAPEINDEX "builds the utility program shapeindex" ON)
 option(BUILD_UTILITY_SVG2PNG "builds the utility program svg2png" ON)
 
-set(CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
 
 find_package(Boost 1.74 REQUIRED COMPONENTS filesystem system regex program_options)
 find_package(ICU REQUIRED COMPONENTS uc)