luftboot.diff

diff --git a/src/luftboot.c b/src/luftboot.c
index d83cd52..730c420 100644
--- a/src/luftboot.c
+++ b/src/luftboot.c
@@ -483,7 +483,7 @@ int main(void)
 
        gpio_init();
 
-       systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
+       systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8);
        systick_set_reload(900000);
        systick_interrupt_enable();
        systick_counter_enable();