diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 0c0865ae1..9efb98d99 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -33,7 +33,6 @@ set(CPPFILES
   Fl_Menu.cxx
   Fl_Menu_.cxx
   Fl_Menu_Bar.cxx
-  Fl_Sys_Menu_Bar.cxx
   Fl_Menu_Button.cxx
   Fl_Menu_Window.cxx
   Fl_Menu_add.cxx
@@ -199,6 +198,7 @@ if(APPLE)
 		Fl_cocoa.mm
 		Fl_Quartz_Printer.mm
 		Fl_Native_File_Chooser_MAC.mm
+		Fl_Sys_Menu_Bar.mm
 		)
 else()
    set(MMFILES