diff --git a/bsp/at91sam9260/startup.c b/bsp/at91sam9260/startup.c
index f78eff800..614bc133d 100755
--- a/bsp/at91sam9260/startup.c
+++ b/bsp/at91sam9260/startup.c
@@ -49,7 +49,7 @@ extern struct rt_device uart0_device;
 	rt_uint8_t _fiq_stack_start[1024];
 	rt_uint8_t _undefined_stack_start[512];
 	rt_uint8_t _abort_stack_start[512];
-	rt_uint8_t _svc_stack_start[1024] SECTION(".nobss");
+	rt_uint8_t _svc_stack_start[4096] SECTION(".nobss");
 	extern unsigned char __bss_start;
 	extern unsigned char __bss_end;
 #endif