diff --git a/pkg/services/ngalert/models/instance.go b/pkg/services/ngalert/models/instance.go
index d2537ba7f03..64b2db99430 100644
--- a/pkg/services/ngalert/models/instance.go
+++ b/pkg/services/ngalert/models/instance.go
@@ -55,6 +55,7 @@ func (i InstanceStateType) IsValid() bool {
 type ListAlertInstancesQuery struct {
 	RuleUID   string
 	RuleOrgID int64 `json:"-"`
+	RuleGroup string
 }
 
 // ValidateAlertInstance validates that the alert instance contains an alert rule id,
diff --git a/pkg/services/ngalert/store/instance_database.go b/pkg/services/ngalert/store/instance_database.go
index 4ede66e2a4a..35a88c9599c 100644
--- a/pkg/services/ngalert/store/instance_database.go
+++ b/pkg/services/ngalert/store/instance_database.go
@@ -33,6 +33,9 @@ func (st DBstore) ListAlertInstances(ctx context.Context, cmd *models.ListAlertI
 		if cmd.RuleUID != "" {
 			addToQuery(` AND rule_uid = ?`, cmd.RuleUID)
 		}
+		if cmd.RuleGroup != "" {
+			return errors.New("filtering by RuleGroup is not supported")
+		}
 
 		if st.FeatureToggles.IsEnabled(ctx, featuremgmt.FlagAlertingNoNormalState) {
 			s.WriteString(fmt.Sprintf(" AND NOT (current_state = '%s' AND current_reason = '')", models.InstanceStateNormal))