diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 087141447..02b07ffeb 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -37,6 +37,7 @@ set(raylib_sources
     rtext.c
     rtextures.c
     utils.c
+    _cocoalayer.mm
     )
 
 # <root>/cmake/GlfwImport.cmake handles the details around the inclusion of glfw