diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 8dc7ee1..a0bc7d3 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -635,7 +635,7 @@
 		__bss_start, __bss_stop,
 		_sdata, _edata,
 		(void *)&init_thread_union,
-		(void *)((int)(&init_thread_union) + 0x2000),
+		(void *)((int)(&init_thread_union) + THREAD_SIZE),
 		__init_begin, __init_end,
 		(void *)_ramstart, (void *)memory_end
 #ifdef CONFIG_MTD_UCLINUX