diff --git a/api/prometheus/v1/example_test.go b/api/prometheus/v1/example_test.go
index 9cd42863e..66f45bf38 100644
--- a/api/prometheus/v1/example_test.go
+++ b/api/prometheus/v1/example_test.go
@@ -28,9 +28,11 @@ import (
 	v1 "github.com/prometheus/client_golang/api/prometheus/v1"
 )
 
+const DemoPrometheusURL = "https://demo.prometheus.io:443"
+
 func ExampleAPI_query() {
 	client, err := api.NewClient(api.Config{
-		Address: "http://demo.robustperception.io:9090",
+		Address: DemoPrometheusURL,
 	})
 	if err != nil {
 		fmt.Printf("Error creating client: %v\n", err)
@@ -53,7 +55,7 @@ func ExampleAPI_query() {
 
 func ExampleAPI_queryRange() {
 	client, err := api.NewClient(api.Config{
-		Address: "http://demo.robustperception.io:9090",
+		Address: DemoPrometheusURL,
 	})
 	if err != nil {
 		fmt.Printf("Error creating client: %v\n", err)
@@ -104,7 +106,7 @@ func (u userAgentRoundTripper) RoundTrip(r *http.Request) (*http.Response, error
 
 func ExampleAPI_queryRangeWithUserAgent() {
 	client, err := api.NewClient(api.Config{
-		Address:      "http://demo.robustperception.io:9090",
+		Address:      DemoPrometheusURL,
 		RoundTripper: userAgentRoundTripper{name: "Client-Golang", rt: api.DefaultRoundTripper},
 	})
 	if err != nil {
@@ -133,7 +135,7 @@ func ExampleAPI_queryRangeWithUserAgent() {
 
 func ExampleAPI_queryRangeWithBasicAuth() {
 	client, err := api.NewClient(api.Config{
-		Address: "http://demo.robustperception.io:9090",
+		Address: DemoPrometheusURL,
 		// We can use amazing github.com/prometheus/common/config helper!
 		RoundTripper: config.NewBasicAuthRoundTripper(
 			config.NewInlineSecret("me"),
@@ -167,7 +169,7 @@ func ExampleAPI_queryRangeWithBasicAuth() {
 
 func ExampleAPI_queryRangeWithAuthBearerToken() {
 	client, err := api.NewClient(api.Config{
-		Address: "http://demo.robustperception.io:9090",
+		Address: DemoPrometheusURL,
 		// We can use amazing github.com/prometheus/common/config helper!
 		RoundTripper: config.NewAuthorizationCredentialsRoundTripper(
 			"Bearer",
@@ -201,7 +203,7 @@ func ExampleAPI_queryRangeWithAuthBearerToken() {
 
 func ExampleAPI_queryRangeWithAuthBearerTokenHeadersRoundTripper() {
 	client, err := api.NewClient(api.Config{
-		Address: "http://demo.robustperception.io:9090",
+		Address: DemoPrometheusURL,
 		// We can use amazing github.com/prometheus/common/config helper!
 		RoundTripper: config.NewHeadersRoundTripper(
 			&config.Headers{
@@ -240,7 +242,7 @@ func ExampleAPI_queryRangeWithAuthBearerTokenHeadersRoundTripper() {
 
 func ExampleAPI_series() {
 	client, err := api.NewClient(api.Config{
-		Address: "http://demo.robustperception.io:9090",
+		Address: DemoPrometheusURL,
 	})
 	if err != nil {
 		fmt.Printf("Error creating client: %v\n", err)