diff --git a/CMakeLists.txt b/CMakeLists.txt
index 77f0d26..170bd31 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -106,7 +106,7 @@ if (NOT DEFINED CMAKE_CXX_STANDARD)
       CXX_STANDARD 11)
 endif()
 
-if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+if(YAML_CPP_MAIN_PROJECT)
   target_compile_options(yaml-cpp
     PRIVATE
       $<${not-msvc}:-Wall -Wextra -Wshadow -Weffc++ -Wno-long-long>