diff --git a/pkg/services/alerting/rule.go b/pkg/services/alerting/rule.go
index 902c1660976..f55488dc795 100644
--- a/pkg/services/alerting/rule.go
+++ b/pkg/services/alerting/rule.go
@@ -73,6 +73,7 @@ var unitMultiplier = map[string]int{
 	"s": 1,
 	"m": 60,
 	"h": 3600,
+	"d": 86400,
 }
 
 func getTimeDurationStringToSeconds(str string) (int64, error) {
diff --git a/pkg/services/alerting/rule_test.go b/pkg/services/alerting/rule_test.go
index f4172a57e74..ca533c36210 100644
--- a/pkg/services/alerting/rule_test.go
+++ b/pkg/services/alerting/rule_test.go
@@ -24,6 +24,7 @@ func TestAlertRuleFrequencyParsing(t *testing.T) {
 		{input: "10s", result: 10},
 		{input: "10m", result: 600},
 		{input: "1h", result: 3600},
+		{input: "1d", result: 86400},
 		{input: "1o", result: 1},
 		{input: "0s", err: ErrFrequencyCannotBeZeroOrLess},
 		{input: "0m", err: ErrFrequencyCannotBeZeroOrLess},