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-rw-r--r--include/ntp_refclock.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ntp_refclock.h b/include/ntp_refclock.h
index f92d14cdb890c..b264dfaa0d1a7 100644
--- a/include/ntp_refclock.h
+++ b/include/ntp_refclock.h
@@ -220,7 +220,7 @@ extern void refclock_buginfo(sockaddr_u *,
extern void refclock_control(sockaddr_u *,
const struct refclockstat *,
struct refclockstat *);
-extern int refclock_open (char *, u_int, u_int);
+extern int refclock_open (const char *, u_int, u_int);
extern int refclock_setup (int, u_int, u_int);
extern void refclock_timer (struct peer *);
extern void refclock_transmit(struct peer *);