diff --git a/retrieval/scrape.go b/retrieval/scrape.go
index dd482fa4a..7b7a68bed 100644
--- a/retrieval/scrape.go
+++ b/retrieval/scrape.go
@@ -178,8 +178,12 @@ func (sp *scrapePool) reload(cfg *config.ScrapeConfig) {
 
 	for fp, oldLoop := range sp.loops {
 		var (
-			t       = sp.targets[fp]
-			s       = &targetScraper{Target: t, client: sp.client}
+			t = sp.targets[fp]
+			s = &targetScraper{
+				Target:  t,
+				client:  sp.client,
+				timeout: timeout,
+			}
 			newLoop = sp.newLoop(sp.ctx, s, sp.appender, t.Labels(), sp.config)
 		)
 		wg.Add(1)
@@ -240,7 +244,12 @@ func (sp *scrapePool) sync(targets []*Target) {
 		uniqueTargets[hash] = struct{}{}
 
 		if _, ok := sp.targets[hash]; !ok {
-			s := &targetScraper{Target: t, client: sp.client}
+			s := &targetScraper{
+				Target:  t,
+				client:  sp.client,
+				timeout: timeout,
+			}
+
 			l := sp.newLoop(sp.ctx, s, sp.appender, t.Labels(), sp.config)
 
 			sp.targets[hash] = t
@@ -283,7 +292,8 @@ type scraper interface {
 // targetScraper implements the scraper interface for a target.
 type targetScraper struct {
 	*Target
-	client *http.Client
+	client  *http.Client
+	timeout time.Duration
 }
 
 const acceptHeader = `application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited;q=0.7,text/plain;version=0.0.4;q=0.3,*/*;q=0.1`
@@ -297,6 +307,7 @@ func (s *targetScraper) scrape(ctx context.Context, ts time.Time) (model.Samples
 	}
 	req.Header.Add("Accept", acceptHeader)
 	req.Header.Set("User-Agent", userAgentHeader)
+	req.Header.Set("Scrape-Timeout-Seconds", fmt.Sprintf("%f", s.timeout.Seconds()))
 
 	resp, err := ctxhttp.Do(ctx, s.client, req)
 	if err != nil {
diff --git a/retrieval/scrape_test.go b/retrieval/scrape_test.go
index 0aec04539..aaae23b77 100644
--- a/retrieval/scrape_test.go
+++ b/retrieval/scrape_test.go
@@ -581,8 +581,20 @@ func TestScrapeLoopRun(t *testing.T) {
 }
 
 func TestTargetScraperScrapeOK(t *testing.T) {
+	const (
+		configTimeout   = 1500 * time.Millisecond
+		expectedTimeout = "1.500000"
+	)
+
 	server := httptest.NewServer(
 		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			timeout := r.Header.Get("Scrape-Timeout-Seconds")
+			if timeout != expectedTimeout {
+				t.Errorf("Scrape timeout did not match expected timeout")
+				t.Errorf("Expected: %v", expectedTimeout)
+				t.Fatalf("Got: %v", timeout)
+			}
+
 			w.Header().Set("Content-Type", `text/plain; version=0.0.4`)
 			w.Write([]byte("metric_a 1\nmetric_b 2\n"))
 		}),
@@ -601,7 +613,8 @@ func TestTargetScraperScrapeOK(t *testing.T) {
 				model.AddressLabel: model.LabelValue(serverURL.Host),
 			},
 		},
-		client: http.DefaultClient,
+		client:  http.DefaultClient,
+		timeout: configTimeout,
 	}
 	now := time.Now()