diff --git a/sys/arm/at91/files.at91 b/sys/arm/at91/files.at91
index dbeb8ede7333..0795eae928df 100644
--- a/sys/arm/at91/files.at91
+++ b/sys/arm/at91/files.at91
@@ -3,15 +3,15 @@ arm/arm/cpufunc_asm_arm9.S	standard
 arm/arm/irq_dispatch.S		standard
 arm/at91/at91.c			standard
 arm/at91/at91_st.c		standard
-arm/at91/uart_bus_at91usart.c	optional	uart
-arm/at91/uart_cpu_at91rm9200usart.c	optional	uart
-arm/at91/uart_dev_at91usart.c	optional	uart
-arm/at91/if_ate.c		optional	ate
 arm/at91/at91_mci.c		optional	at91_mci
-arm/at91/at91_pio.c		optional	at91_pio
-arm/at91/at91_pmc.c		optional	at91_pmc
+arm/at91/at91_pio.c		standard
+arm/at91/at91_pmc.c		standard
 arm/at91/at91_ssc.c		optional	at91_ssc
 arm/at91/at91_spi.c		optional	at91_spi
 arm/at91/at91_twi.c		optional	at91_twi
 arm/at91/at91_udp.c		optional	at91_udp
+arm/at91/if_ate.c		optional	ate
 arm/at91/ohci_atmelarm.c	optional	ohci
+arm/at91/uart_bus_at91usart.c	optional	uart
+arm/at91/uart_cpu_at91rm9200usart.c	optional	uart
+arm/at91/uart_dev_at91usart.c	optional	uart