diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e18f3a..2baf813 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ project(cppout LANGUAGES CXX)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-file(GLOB SOURCE_FILES "src/*.cpp")
+file(GLOB SOURCE_FILES "src/*.cpp" "src/*/*.cpp")
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)