diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -24,6 +24,7 @@ add_subdirectory(sound)
 add_subdirectory(spriteloader)
 add_subdirectory(table)
 add_subdirectory(tests)
+add_subdirectory(timer)
 add_subdirectory(video)
 add_subdirectory(widgets)