diff --git a/keyforkd/src/service.rs b/keyforkd/src/service.rs
index 5e2db9a..66a62fc 100644
--- a/keyforkd/src/service.rs
+++ b/keyforkd/src/service.rs
@@ -4,6 +4,9 @@ use keyfork_derive_util::request::{DerivationError, DerivationRequest, Derivatio
 use keyfork_mnemonic_util::Mnemonic;
 use tower::Service;
 
+// NOTE: All values implemented in Keyforkd must implement Clone with low overhead, either by
+// using an Arc or by having a small signature. This is because Service<T> takes &mut self.
+
 #[derive(Clone, Debug)]
 pub struct Keyforkd {
     mnemonic: Arc<Mnemonic>,
@@ -33,7 +36,7 @@ impl Service<DerivationRequest> for Keyforkd {
 
     #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]
     fn call(&mut self, req: DerivationRequest) -> Self::Future {
-        let app = self.clone();
-        Box::pin(async { req.derive_with_mnemonic(&app.mnemonic) })
+        let mnemonic = self.mnemonic.clone();
+        Box::pin(async { req.derive_with_mnemonic(&mnemonic) })
     }
 }