diff --git a/server/src/http/unleash_client.rs b/server/src/http/unleash_client.rs
index 5f4562e5..f0e533b0 100644
--- a/server/src/http/unleash_client.rs
+++ b/server/src/http/unleash_client.rs
@@ -678,7 +678,7 @@ mod tests {
     fn expected_etag(features: ClientFeatures) -> String {
         let hash = features.xx3_hash().unwrap();
         let len = serde_json::to_string(&features)
-            .map(|string| string.as_bytes().len())
+            .map(|string| string.len())
             .unwrap();
         format!("{len:x}-{hash}")
     }
diff --git a/server/src/metrics/client_metrics.rs b/server/src/metrics/client_metrics.rs
index 4b9de354..e64d6261 100644
--- a/server/src/metrics/client_metrics.rs
+++ b/server/src/metrics/client_metrics.rs
@@ -107,7 +107,7 @@ pub struct MetricsCache {
 
 pub(crate) fn size_of_batch(batch: &MetricsBatch) -> usize {
     serde_json::to_string(batch)
-        .map(|s| s.as_bytes().len())
+        .map(|s| s.len())
         .unwrap_or(0)
 }