diff --git a/cpu/lpc2387/include/vendor/lpc23xx.h b/cpu/lpc2387/include/vendor/lpc23xx.h
index cf54704277..63f2e8c7d9 100644
--- a/cpu/lpc2387/include/vendor/lpc23xx.h
+++ b/cpu/lpc2387/include/vendor/lpc23xx.h
@@ -424,6 +424,10 @@ Reset, and Code Security/Debugging */
 
 /* Reset, reset source identification */
 #define RSIR           (*(volatile unsigned long *)(SCB_BASE_ADDR + 0x180))
+#define RSIR_POR       (BIT0)
+#define RSIR_EXTR      (BIT1)
+#define RSIR_WDTR      (BIT2)
+#define RSIR_BODR      (BIT3)
 
 /* RSID, code security protection */
 #define CSPR           (*(volatile unsigned long *)(SCB_BASE_ADDR + 0x184))