diff --git a/drivers/serial/sunsab.h b/drivers/serial/sunsab.h
index 686086f..b78e1f7 100644
--- a/drivers/serial/sunsab.h
+++ b/drivers/serial/sunsab.h
@@ -126,6 +126,7 @@
 /* irqflags bits */
 #define SAB82532_ALLS			0x00000001
 #define SAB82532_XPR			0x00000002
+#define SAB82532_REGS_PENDING		0x00000004
 
 /* RFIFO Status Byte */
 #define SAB82532_RSTAT_PE		0x80