diff --git a/src/timer/CMakeLists.txt b/src/timer/CMakeLists.txt
new file mode 100644
--- /dev/null
+++ b/src/timer/CMakeLists.txt
@@ -0,0 +1,8 @@
+add_files(
+    timer_game_calendar.cpp
+    timer_game_calendar.h
+    timer_window.cpp
+    timer_window.h
+    timer_manager.h
+    timer.h
+)