diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc30013b..9fb9f4c5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ cmake_minimum_required(VERSION 3.0.0)
 ## PROJECT
 ## name and version
 ##
-project(nlohmann_json VERSION 2.1.1)
+project(nlohmann_json VERSION 2.1.1 LANGUAGES CXX)
 
 ##
 ## OPTIONS