#define safe_object_get_size sgen_safe_object_get_size
-#if defined(PLATFORM_MACOSX) || defined(HOST_WIN32) || (defined(__linux__) && !defined(PLATFORM_ANDROID))
+#if defined(HAVE_CONC_GC_AS_DEFAULT)
/* Use concurrent major on deskstop platforms */
#define DEFAULT_MAJOR_INIT sgen_marksweep_conc_init
#define DEFAULT_MAJOR_NAME "marksweep-conc"