diff --git a/sys/arm/at91/at91sam9260reg.h b/sys/arm/at91/at91sam9260reg.h
index cc83a531f843..1609ed17e869 100644
--- a/sys/arm/at91/at91sam9260reg.h
+++ b/sys/arm/at91/at91sam9260reg.h
@@ -231,7 +231,7 @@
 #define AT91SAM9260_WDT_SIZE	0x10
 
 #define AT91SAM9260_PIT_BASE	0xffffd30
-#define AT91SAM9260_PIT_SIZE	10
+#define AT91SAM9260_PIT_SIZE	0x10
 
 #define AT91SAM9260_SMC_BASE	0xfffec00
 #define AT91SAM9260_SMC_SIZE	0x200