diff --git a/infra/conf/geodata.go b/infra/conf/geodata.go
index f79a37e23..42b0961bf 100644
--- a/infra/conf/geodata.go
+++ b/infra/conf/geodata.go
@@ -4,6 +4,7 @@ import (
 	"net/url"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/robfig/cron/v3"
 	"github.com/xtls/xray-core/app/geodata"
@@ -44,6 +45,17 @@ func validateHTTPS(s string) error {
 	return nil
 }
 
+func validateGeodataCron(spec string) error {
+	schedule, err := cron.ParseStandard(spec)
+	if err != nil {
+		return err
+	}
+	if interval, ok := schedule.(cron.ConstantDelaySchedule); ok && interval.Delay < time.Minute {
+		return errors.New("interval must be at least 1 minute")
+	}
+	return nil
+}
+
 type GeodataConfig struct {
 	Cron     *string               `json:"cron"`
 	Outbound string                `json:"outbound"`
@@ -54,7 +66,7 @@ func (c *GeodataConfig) Build() (proto.Message, error) {
 	config := &geodata.Config{}
 
 	if c.Cron != nil {
-		if _, err := cron.ParseStandard(*c.Cron); err != nil {
+		if err := validateGeodataCron(*c.Cron); err != nil {
 			return nil, errors.New("invalid geodata cron").Base(err)
 		}
 		config.Cron = *c.Cron
diff --git a/infra/conf/geodata_test.go b/infra/conf/geodata_test.go
index 4944d850a..97fe03087 100644
--- a/infra/conf/geodata_test.go
+++ b/infra/conf/geodata_test.go
@@ -106,3 +106,42 @@ func TestGeodataAssetConfigFileExtension(t *testing.T) {
 		}
 	}
 }
+
+func TestGeodataConfigCronFrequency(t *testing.T) {
+	for _, tc := range []struct {
+		cron      string
+		wantError string
+	}{
+		{"0 * * * *", ""},
+		{"15 */2 * * *", ""},
+		{"0 4 * * *", ""},
+		{"*/60 * * * *", ""},
+		{"0,0 * * * *", ""},
+		{"CRON_TZ=Asia/Singapore 30 * * * *", ""},
+		{"@hourly", ""},
+		{"@daily", ""},
+		{"@every 1m", ""},
+		{"@every 1h", ""},
+		{"@every 1h30m", ""},
+		{"* * * * *", ""},
+		{"*/30 * * * *", ""},
+		{"0,59 4 * * *", ""},
+		{"0-1 4 1 1 *", ""},
+		{"@every 59m59s", ""},
+		{"@every 1s", "interval must be at least 1 minute"},
+		{"@every 59s", "interval must be at least 1 minute"},
+		{"@every 59.999s", "interval must be at least 1 minute"},
+		{"invalid", "invalid geodata cron"},
+	} {
+		t.Run(tc.cron, func(t *testing.T) {
+			_, err := (&GeodataConfig{Cron: &tc.cron}).Build()
+			if tc.wantError == "" {
+				if err != nil {
+					t.Fatal(err)
+				}
+			} else if err == nil || !strings.Contains(err.Error(), tc.wantError) {
+				t.Fatalf("Build() error = %v; want %q", err, tc.wantError)
+			}
+		})
+	}
+}