diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h
index 717059d..1c297dd 100644
--- a/include/linux/serial_sci.h
+++ b/include/linux/serial_sci.h
@@ -25,6 +25,7 @@
 	unsigned int	irqs[SCIx_NR_IRQS];	/* ERI, RXI, TXI, BRI */
 	unsigned int	type;			/* SCI / SCIF / IRDA */
 	upf_t		flags;			/* UPF_* flags */
+	char		*clk;			/* clock string */
 };
 
 #endif /* __LINUX_SERIAL_SCI_H */