diff --git a/tariff/fixed.go b/tariff/fixed.go
index da317af26..4c97328e0 100644
--- a/tariff/fixed.go
+++ b/tariff/fixed.go
@@ -83,7 +83,7 @@ func NewFixedFromConfig(other map[string]interface{}) (api.Tariff, error) {
 func (t *Fixed) Rates() (api.Rates, error) {
 	var res api.Rates
 
-	start := carbon.FromStdTime(t.clock.Now().Local()).StartOfDay()
+	start := carbon.CreateFromStdTime(t.clock.Now().Local()).StartOfDay()
 	for i := 0; i < 7; i++ {
 		dow := fixed.Day((start.DayOfWeek() + i) % 7)
 
diff --git a/tariff/fixed_test.go b/tariff/fixed_test.go
index 12a6aaf18..62c964ebc 100644
--- a/tariff/fixed_test.go
+++ b/tariff/fixed_test.go
@@ -20,7 +20,7 @@ func TestFixed(t *testing.T) {
 
 	var expect api.Rates
 	for dow := 0; dow < 7; dow++ {
-		dayStart := carbon.FromStdTime(tf.clock.Now()).StartOfDay().AddDays(dow)
+		dayStart := carbon.CreateFromStdTime(tf.clock.Now()).StartOfDay().AddDays(dow)
 
 		for hour := 0; hour < 24; hour++ {
 			expect = append(expect, api.Rate{
@@ -53,7 +53,7 @@ func TestFixedSplitZones(t *testing.T) {
 
 	var expect api.Rates
 	for i := 0; i < 7; i++ {
-		dayStart := carbon.FromStdTime(tf.clock.Now()).StartOfDay().AddDays(i)
+		dayStart := carbon.CreateFromStdTime(tf.clock.Now()).StartOfDay().AddDays(i)
 
 		// 00:00-05:00 0.1
 		for hour := 0; hour < 5; hour++ {