diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12acaa3..219a714 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -44,4 +44,6 @@ if(CXXOPTS_USE_UNICODE_HELP)
   set(CXXOPTS_LINKER_LIBRARIES "${ICU_LIBRARIES}")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DCXXOPTS_USE_UNICODE")
 
-endif()
\ No newline at end of file
+endif()
+
+add_subdirectory(src)