diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 30b64f3..f6fca8f 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -104,7 +104,7 @@
 #define PORT_MPSC	63
 
 /* TXX9 type number */
-#define PORT_TXX9       64
+#define PORT_TXX9	64
 
 /* NEC VR4100 series SIU/DSIU */
 #define PORT_VR41XX_SIU		65