diff --git a/common/serial.c b/common/serial.c
index 03bbb19..75cc1bb 100644
--- a/common/serial.c
+++ b/common/serial.c
@@ -149,7 +149,7 @@
 	}
 }
 
-int serial_assign(char *name)
+int serial_assign(const char *name)
 {
 	struct serial_device *s;
 
diff --git a/include/serial.h b/include/serial.h
index 9d623ca..fbc1036 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -93,7 +93,7 @@
 extern void serial_register(struct serial_device *);
 extern void serial_initialize(void);
 extern void serial_stdio_init(void);
-extern int serial_assign(char *name);
+extern int serial_assign(const char *name);
 extern void serial_reinit_all(void);
 
 /* For usbtty */