diff --git a/web/api/v1/api.go b/web/api/v1/api.go
index d9d4cfd1df..edbbe8d80b 100644
--- a/web/api/v1/api.go
+++ b/web/api/v1/api.go
@@ -879,9 +879,9 @@ func (api *API) dropSeries(_ *http.Request) apiFuncResult {
 // Target has the information for one target.
 type Target struct {
 	// Labels before any processing.
-	DiscoveredLabels map[string]string `json:"discoveredLabels"`
+	DiscoveredLabels labels.Labels `json:"discoveredLabels"`
 	// Any labels that are added to this target and its metrics.
-	Labels map[string]string `json:"labels"`
+	Labels labels.Labels `json:"labels"`
 
 	ScrapePool string `json:"scrapePool"`
 	ScrapeURL  string `json:"scrapeUrl"`
@@ -1024,8 +1024,8 @@ func (api *API) targets(r *http.Request) apiFuncResult {
 				globalURL, err := getGlobalURL(target.URL(), api.globalURLOptions)
 
 				res.ActiveTargets = append(res.ActiveTargets, &Target{
-					DiscoveredLabels: target.DiscoveredLabels().Map(),
-					Labels:           target.Labels().Map(),
+					DiscoveredLabels: target.DiscoveredLabels(),
+					Labels:           target.Labels(),
 					ScrapePool:       key,
 					ScrapeURL:        target.URL().String(),
 					GlobalURL:        globalURL.String(),
diff --git a/web/api/v1/api_test.go b/web/api/v1/api_test.go
index c9ab84087e..9100a9ef90 100644
--- a/web/api/v1/api_test.go
+++ b/web/api/v1/api_test.go
@@ -1411,10 +1411,8 @@ func testEndpoints(t *testing.T, api *API, tr *testTargetRetriever, es storage.E
 			response: &TargetDiscovery{
 				ActiveTargets: []*Target{
 					{
-						DiscoveredLabels: map[string]string{},
-						Labels: map[string]string{
-							"job": "blackbox",
-						},
+						DiscoveredLabels:   labels.FromStrings(),
+						Labels:             labels.FromStrings("job", "blackbox"),
 						ScrapePool:         "blackbox",
 						ScrapeURL:          "http://localhost:9115/probe?target=example.com",
 						GlobalURL:          "http://localhost:9115/probe?target=example.com",
@@ -1426,10 +1424,8 @@ func testEndpoints(t *testing.T, api *API, tr *testTargetRetriever, es storage.E
 						ScrapeTimeout:      "10s",
 					},
 					{
-						DiscoveredLabels: map[string]string{},
-						Labels: map[string]string{
-							"job": "test",
-						},
+						DiscoveredLabels:   labels.FromStrings(),
+						Labels:             labels.FromStrings("job", "test"),
 						ScrapePool:         "test",
 						ScrapeURL:          "http://example.com:8080/metrics",
 						GlobalURL:          "http://example.com:8080/metrics",
@@ -1464,10 +1460,8 @@ func testEndpoints(t *testing.T, api *API, tr *testTargetRetriever, es storage.E
 			response: &TargetDiscovery{
 				ActiveTargets: []*Target{
 					{
-						DiscoveredLabels: map[string]string{},
-						Labels: map[string]string{
-							"job": "blackbox",
-						},
+						DiscoveredLabels:   labels.FromStrings(),
+						Labels:             labels.FromStrings("job", "blackbox"),
 						ScrapePool:         "blackbox",
 						ScrapeURL:          "http://localhost:9115/probe?target=example.com",
 						GlobalURL:          "http://localhost:9115/probe?target=example.com",
@@ -1479,10 +1473,8 @@ func testEndpoints(t *testing.T, api *API, tr *testTargetRetriever, es storage.E
 						ScrapeTimeout:      "10s",
 					},
 					{
-						DiscoveredLabels: map[string]string{},
-						Labels: map[string]string{
-							"job": "test",
-						},
+						DiscoveredLabels:   labels.FromStrings(),
+						Labels:             labels.FromStrings("job", "test"),
 						ScrapePool:         "test",
 						ScrapeURL:          "http://example.com:8080/metrics",
 						GlobalURL:          "http://example.com:8080/metrics",
@@ -1517,10 +1509,8 @@ func testEndpoints(t *testing.T, api *API, tr *testTargetRetriever, es storage.E
 			response: &TargetDiscovery{
 				ActiveTargets: []*Target{
 					{
-						DiscoveredLabels: map[string]string{},
-						Labels: map[string]string{
-							"job": "blackbox",
-						},
+						DiscoveredLabels:   labels.FromStrings(),
+						Labels:             labels.FromStrings("job", "blackbox"),
 						ScrapePool:         "blackbox",
 						ScrapeURL:          "http://localhost:9115/probe?target=example.com",
 						GlobalURL:          "http://localhost:9115/probe?target=example.com",
@@ -1532,10 +1522,8 @@ func testEndpoints(t *testing.T, api *API, tr *testTargetRetriever, es storage.E
 						ScrapeTimeout:      "10s",
 					},
 					{
-						DiscoveredLabels: map[string]string{},
-						Labels: map[string]string{
-							"job": "test",
-						},
+						DiscoveredLabels:   labels.FromStrings(),
+						Labels:             labels.FromStrings("job", "test"),
 						ScrapePool:         "test",
 						ScrapeURL:          "http://example.com:8080/metrics",
 						GlobalURL:          "http://example.com:8080/metrics",