diff --git a/src/lib.rs b/src/lib.rs
index 7444ffc..dbeaf6f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -105,7 +105,7 @@ struct Inner {
 #[derive(Debug)]
 pub struct ExporterMetrics {
     /// Subsystem request histogram
-    subsystem_req_histogram: HistogramVec,
+    subsystem_request_histogram: HistogramVec,
     /// Cluster health status
     cluster_health_status: IntGaugeVec,
 }
@@ -167,7 +167,7 @@ impl Exporter {
         let _ = const_labels.insert("cluster".into(), cluster_name.clone());
 
         let metrics = ExporterMetrics {
-            subsystem_req_histogram: HistogramVec::new(
+            subsystem_request_histogram: HistogramVec::new(
                 HistogramOpts::new(
                     "subsystem_request_duration_seconds",
                     "The Elasticsearch subsystem request latencies in seconds.",
@@ -189,7 +189,7 @@ impl Exporter {
         };
 
         default_registry().register(Box::new(metrics.cluster_health_status.clone()))?;
-        default_registry().register(Box::new(metrics.subsystem_req_histogram.clone()))?;
+        default_registry().register(Box::new(metrics.subsystem_request_histogram.clone()))?;
 
         Ok(Self(Arc::new(Inner {
             cluster_name,
diff --git a/src/metadata/node_data.rs b/src/metadata/node_data.rs
index 7817f64..a2af2df 100644
--- a/src/metadata/node_data.rs
+++ b/src/metadata/node_data.rs
@@ -61,7 +61,7 @@ pub(crate) async fn poll(exporter: Exporter) {
 
         let timer: prometheus::HistogramTimer = exporter
             .metrics()
-            .subsystem_req_histogram
+            .subsystem_request_histogram
             .with_label_values(&["/_nodes/os", exporter.cluster_name()])
             .start_timer();