diff --git a/zenoh/src/queryable.rs b/zenoh/src/queryable.rs
index 599c0e13be..58589bfe8f 100644
--- a/zenoh/src/queryable.rs
+++ b/zenoh/src/queryable.rs
@@ -111,7 +111,7 @@ impl Query {
     #[inline(always)]
     #[cfg(feature = "unstable")]
     #[doc(hidden)]
-    pub fn reply_sample(&self, sample: Sample) -> ReplyBuilder<'_> {
+    pub fn reply_sample(&self, sample: Sample) -> ReplyBuilder<'_, 'static> {
         let Sample {
             key_expr,
             payload,
@@ -126,7 +126,7 @@ impl Query {
         } = sample;
         ReplyBuilder {
             query: self,
-            key_expr,
+            key_expr: Ok(key_expr),
             payload,
             kind,
             encoding,
@@ -145,18 +145,19 @@ impl Query {
     /// Unless the query has enabled disjoint replies (you can check this through [`Query::accepts_replies`]),
     /// replying on a disjoint key expression will result in an error when resolving the reply.
     #[inline(always)]
-    pub fn reply<IntoKeyExpr, IntoPayload>(
+    pub fn reply<'b, TryIntoKeyExpr, IntoPayload>(
         &self,
-        key_expr: IntoKeyExpr,
+        key_expr: TryIntoKeyExpr,
         payload: IntoPayload,
-    ) -> ReplyBuilder<'_>
+    ) -> ReplyBuilder<'_, 'b>
     where
-        IntoKeyExpr: Into<KeyExpr<'static>>,
+        TryIntoKeyExpr: TryInto<KeyExpr<'b>>,
+        <TryIntoKeyExpr as TryInto<KeyExpr<'b>>>::Error: Into<zenoh_result::Error>,
         IntoPayload: Into<Payload>,
     {
         ReplyBuilder {
             query: self,
-            key_expr: key_expr.into(),
+            key_expr: key_expr.try_into().map_err(Into::into),
             payload: payload.into(),
             kind: SampleKind::Put,
             timestamp: None,
@@ -187,13 +188,14 @@ impl Query {
     /// Unless the query has enabled disjoint replies (you can check this through [`Query::accepts_replies`]),
     /// replying on a disjoint key expression will result in an error when resolving the reply.
     #[inline(always)]
-    pub fn reply_del<IntoKeyExpr>(&self, key_expr: IntoKeyExpr) -> ReplyBuilder<'_>
+    pub fn reply_del<'b, TryIntoKeyExpr>(&self, key_expr: TryIntoKeyExpr) -> ReplyBuilder<'_, 'b>
     where
-        IntoKeyExpr: Into<KeyExpr<'static>>,
+        TryIntoKeyExpr: TryInto<KeyExpr<'b>>,
+        <TryIntoKeyExpr as TryInto<KeyExpr<'b>>>::Error: Into<zenoh_result::Error>,
     {
         ReplyBuilder {
             query: self,
-            key_expr: key_expr.into(),
+            key_expr: key_expr.try_into().map_err(Into::into),
             payload: Payload::empty(),
             kind: SampleKind::Delete,
             timestamp: None,
@@ -248,9 +250,9 @@ impl fmt::Display for Query {
 /// A builder returned by [`Query::reply()`](Query::reply) or [`Query::reply()`](Query::reply).
 #[must_use = "Resolvables do nothing unless you resolve them using the `res` method from either `SyncResolve` or `AsyncResolve`"]
 #[derive(Debug)]
-pub struct ReplyBuilder<'a> {
+pub struct ReplyBuilder<'a, 'b> {
     query: &'a Query,
-    key_expr: KeyExpr<'static>,
+    key_expr: ZResult<KeyExpr<'b>>,
     payload: Payload,
     kind: SampleKind,
     encoding: Encoding,
@@ -270,7 +272,7 @@ pub struct ReplyErrBuilder<'a> {
     value: Value,
 }
 
-impl<'a> ReplyBuilder<'a> {
+impl<'a, 'b> ReplyBuilder<'a, 'b> {
     #[zenoh_macros::unstable]
     pub fn with_attachment(mut self, attachment: Attachment) -> Self {
         self.attachment = Some(attachment);
@@ -292,16 +294,17 @@ impl<'a> ReplyBuilder<'a> {
     }
 }
 
-impl<'a> Resolvable for ReplyBuilder<'a> {
+impl<'a, 'b> Resolvable for ReplyBuilder<'a, 'b> {
     type To = ZResult<()>;
 }
 
-impl SyncResolve for ReplyBuilder<'_> {
+impl<'a, 'b> SyncResolve for ReplyBuilder<'a, 'b> {
     fn res_sync(self) -> <Self as Resolvable>::To {
+        let key_expr = self.key_expr?;
         if !self.query._accepts_any_replies().unwrap_or(false)
-            && !self.query.key_expr().intersects(&self.key_expr)
+            && !self.query.key_expr().intersects(&key_expr)
         {
-            bail!("Attempted to reply on `{}`, which does not intersect with query `{}`, despite query only allowing replies on matching key expressions", self.key_expr, self.query.key_expr())
+            bail!("Attempted to reply on `{}`, which does not intersect with query `{}`, despite query only allowing replies on matching key expressions", &key_expr, self.query.key_expr())
         }
         #[allow(unused_mut)] // will be unused if feature = "unstable" is not enabled
         let mut ext_sinfo = None;
@@ -318,7 +321,7 @@ impl SyncResolve for ReplyBuilder<'_> {
             rid: self.query.inner.qid,
             wire_expr: WireExpr {
                 scope: 0,
-                suffix: std::borrow::Cow::Owned(self.key_expr.into()),
+                suffix: std::borrow::Cow::Owned(key_expr.into()),
                 mapping: Mapping::Sender,
             },
             payload: ResponseBody::Reply(zenoh::Reply {
@@ -360,7 +363,7 @@ impl SyncResolve for ReplyBuilder<'_> {
     }
 }
 
-impl<'a> AsyncResolve for ReplyBuilder<'a> {
+impl<'a, 'b> AsyncResolve for ReplyBuilder<'a, 'b> {
     type Future = Ready<Self::To>;
 
     fn res_async(self) -> Self::Future {
diff --git a/zenoh/tests/routing.rs b/zenoh/tests/routing.rs
index c34d06690a..b90f0f568f 100644
--- a/zenoh/tests/routing.rs
+++ b/zenoh/tests/routing.rs
@@ -137,7 +137,7 @@ impl Task {
                     tokio::select! {
                         _  = token.cancelled() => break,
                         query = queryable.recv_async() => {
-                            query?.reply(KeyExpr::try_from(ke.to_owned())?, payload.clone()).res_async().await?;
+                            query?.reply(ke.to_owned(), payload.clone()).res_async().await?;
                         },
                     }
                 }
diff --git a/zenoh/tests/session.rs b/zenoh/tests/session.rs
index 5e86499bc7..8c2d2e9937 100644
--- a/zenoh/tests/session.rs
+++ b/zenoh/tests/session.rs
@@ -164,10 +164,7 @@ async fn test_session_qryrep(peer01: &Session, peer02: &Session, reliability: Re
                     "ok_del" => {
                         tokio::task::block_in_place(|| {
                             tokio::runtime::Handle::current().block_on(async {
-                                ztimeout!(query
-                                    .reply_del(KeyExpr::try_from(key_expr).unwrap())
-                                    .res_async())
-                                .unwrap()
+                                ztimeout!(query.reply_del(key_expr).res_async()).unwrap()
                             })
                         });
                     }