diff --git a/pageserver/src/metrics.rs b/pageserver/src/metrics.rs
index 00745143bd..8765aa6aff 100644
--- a/pageserver/src/metrics.rs
+++ b/pageserver/src/metrics.rs
@@ -204,11 +204,11 @@ pub static TENANT_STATE_METRIC: Lazy<UIntGaugeVec> = Lazy::new(|| {
 
 pub static TENANT_SYNTHETIC_SIZE_METRIC: Lazy<UIntGaugeVec> = Lazy::new(|| {
     register_uint_gauge_vec!(
-        "pageserver_tenant_synthetic_size",
-        "Synthetic size of each tenant",
+        "pageserver_tenant_synthetic_cached_size_bytes",
+        "Synthetic size of each tenant in bytes",
         &["tenant_id"]
     )
-    .expect("Failed to register pageserver_tenant_synthetic_size metric")
+    .expect("Failed to register pageserver_tenant_synthetic_cached_size_bytes metric")
 });
 
 // Metrics for cloud upload. These metrics reflect data uploaded to cloud storage,