diff --git a/CMakeLists.txt b/CMakeLists.txt
index 50cf4a4..f0841cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,8 @@ cmake_minimum_required(VERSION 3.8 FATAL_ERROR)
 
 if(NOT DEFINED PROJECT_NAME)
     set(BUILD_AS_STANDALONE ON)
+else()
+    set(BUILD_AS_STANDALONE OFF)
 endif()
 
 project(enum.hpp)