diff --git a/zipserver/config.go b/zipserver/config.go
index fb5c99b..41f4abf 100644
--- a/zipserver/config.go
+++ b/zipserver/config.go
@@ -115,6 +115,7 @@ type Config struct {
 	ClientEmail    string
 	Bucket         string
 	ExtractPrefix  string
+	MetricsHost    string `json:",omitempty"`
 
 	MaxFileSize       uint64
 	MaxTotalSize      uint64
diff --git a/zipserver/metrics.go b/zipserver/metrics.go
index c11087e..e1abed4 100644
--- a/zipserver/metrics.go
+++ b/zipserver/metrics.go
@@ -20,13 +20,13 @@ type MetricsCounter struct {
 }
 
 // render the metrics in a prometheus compatible format
-func (m *MetricsCounter) RenderMetrics() string {
+func (m *MetricsCounter) RenderMetrics(config *Config) string {
 	var metrics strings.Builder
 
 	valueOfMetrics := reflect.ValueOf(m).Elem()
 
-	hostname, ok := os.LookupEnv("ZIPSERVER_METRICS_HOST")
-	if !ok {
+	hostname := config.MetricsHost
+	if hostname == "" {
 		hostname, _ = os.Hostname()
 	}
 
@@ -47,6 +47,6 @@ func (m *MetricsCounter) RenderMetrics() string {
 // render the global metrics
 func metricsHandler(w http.ResponseWriter, r *http.Request) error {
 	w.Header().Set("Content-Type", "text/plain")
-	w.Write([]byte(globalMetrics.RenderMetrics()))
+	w.Write([]byte(globalMetrics.RenderMetrics(config)))
 	return nil
 }
diff --git a/zipserver/metrics_test.go b/zipserver/metrics_test.go
index 4371d2e..29afa99 100644
--- a/zipserver/metrics_test.go
+++ b/zipserver/metrics_test.go
@@ -19,13 +19,14 @@ func Test_Metrics(t *testing.T) {
 	metrics.TotalExtractedFiles.Add(1)
 	assert.Equal(t, int64(1), metrics.TotalExtractedFiles.Load())
 
-	// Test RenderMetrics
-	t.Setenv("ZIPSERVER_METRICS_HOST", "localhost")
+	config := &Config{
+		MetricsHost: "localhost",
+	}
+
 	expectedMetrics := `zipserver_requests_total{host="localhost"} 1
 zipserver_errors_total{host="localhost"} 0
 zipserver_extracted_files_total{host="localhost"} 1
 zipserver_copied_files_total{host="localhost"} 0
 `
-
-	assert.Equal(t, expectedMetrics, metrics.RenderMetrics())
+	assert.Equal(t, expectedMetrics, metrics.RenderMetrics(config))
 }