diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2732297..ee5767b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,6 @@ set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 
 find_package(Threads REQUIRED)
 
-add_executable(main main.cpp)
+add_executable(main main.cpp al_utility.cpp)
 target_link_libraries(main Threads::Threads)
-set(SOURCE_EXE main.cpp )
+set(SOURCE_EXE main.cpp)