diff --git a/clock.c b/clock.c
index 7acb18e..89cdd78 100644
--- a/clock.c
+++ b/clock.c
@@ -578,7 +578,7 @@ static enum servo_state clock_no_adjust(struct clock *c, tmv_t ingress,
 	if (f->count < f->max_count) {
 		return state;
 	}
-	if (tmv_eq(ingress, f->ingress1)) {
+	if (tmv_cmp(ingress, f->ingress1) == 0) {
 		pr_warning("bad timestamps in rate ratio calculation");
 		return state;
 	}
diff --git a/mmedian.c b/mmedian.c
index 1d15789..2383467 100644
--- a/mmedian.c
+++ b/mmedian.c
@@ -60,7 +60,8 @@ static tmv_t mmedian_sample(struct filter *filter, tmv_t sample)
 
 	/* Insert index of the new value to order. */
 	for (i = m->cnt - 1; i > 0; i--) {
-		if (m->samples[m->order[i - 1]] <= m->samples[m->index])
+		if (tmv_cmp(m->samples[m->order[i - 1]],
+			    m->samples[m->index]) <= 0)
 			break;
 		m->order[i] = m->order[i - 1];
 	}
diff --git a/port.c b/port.c
index c3594d5..59e8b5e 100644
--- a/port.c
+++ b/port.c
@@ -933,7 +933,7 @@ static void port_nrate_calculate(struct port *p, tmv_t origin, tmv_t ingress)
 	if (n->count < n->max_count) {
 		return;
 	}
-	if (tmv_eq(ingress, n->ingress1)) {
+	if (tmv_cmp(ingress, n->ingress1) == 0) {
 		pr_warning("bad timestamps in nrate calculation");
 		return;
 	}
diff --git a/tmv.h b/tmv.h
index 30b41ee..5717846 100644
--- a/tmv.h
+++ b/tmv.h
@@ -51,9 +51,9 @@ static inline tmv_t tmv_div(tmv_t a, int divisor)
 	return a / divisor;
 }
 
-static inline int tmv_eq(tmv_t a, tmv_t b)
+static inline int tmv_cmp(tmv_t a, tmv_t b)
 {
-	return a == b ? 1 : 0;
+	return a == b ? 0 : a > b ? +1 : -1;
 }
 
 static inline int tmv_is_zero(tmv_t x)