diff --git a/clock.c b/clock.c
index 1ba30ee..dedf8e0 100644
--- a/clock.c
+++ b/clock.c
@@ -592,7 +592,7 @@ struct clock *clock_create(int phc_index, struct interface *iface, int count,
 	} else {
 		c->clkid = CLOCK_REALTIME;
 		c->utc_timescale = 1;
-		max_adj = clockadj_get_max_freq(c->clkid);
+		max_adj = sysclk_max_freq();
 		clockadj_set_leap(c->clkid, 0);
 	}
 	c->leap_set = 0;
diff --git a/clockadj.c b/clockadj.c
index 7587dda..870ee61 100644
--- a/clockadj.c
+++ b/clockadj.c
@@ -95,8 +95,9 @@ void clockadj_set_leap(clockid_t clkid, int leap)
 		pr_notice(m);
 }
 
-int clockadj_get_max_freq(clockid_t clkid)
+int sysclk_max_freq(void)
 {
+	clockid_t clkid = CLOCK_REALTIME;
 	int f = 0;
 	struct timex tx;
 	memset(&tx, 0, sizeof(tx));
diff --git a/clockadj.h b/clockadj.h
index 5b91d40..d9a8a65 100644
--- a/clockadj.h
+++ b/clockadj.h
@@ -53,9 +53,9 @@ void clockadj_step(clockid_t clkid, int64_t step);
 void clockadj_set_leap(clockid_t clkid, int leap);
 
 /**
- * Read clock's maximum frequency adjustment.
- * @param clkid CLOCK_REALTIME.
- * @return      The maximum frequency adjustment in parts per billion (ppb).
+ * Read maximum frequency adjustment of the system clock (CLOCK_REALTIME).
+ * @return The maximum frequency adjustment in parts per billion (ppb).
  */
-int clockadj_get_max_freq(clockid_t clkid);
+int sysclk_max_freq(void);
+
 #endif