diff --git a/rumqttc/src/v5/client.rs b/rumqttc/src/v5/client.rs
index 7a86333f2..5babdb247 100644
--- a/rumqttc/src/v5/client.rs
+++ b/rumqttc/src/v5/client.rs
@@ -83,11 +83,13 @@ impl AsyncClient {
         S: Into<String>,
         P: Into<Bytes>,
     {
-        let topic = topic.into();
-        let mut publish = Publish::new(&topic, qos, payload, properties);
+        let topic: String = topic.into();
+        let topic_valid = valid_topic(&topic);
+        let topic_bytes = Bytes::from(topic.into_bytes());
+        let mut publish = Publish::new(topic_bytes, qos, payload, properties);
         publish.retain = retain;
         let publish = Request::Publish(publish);
-        if !valid_topic(&topic) {
+        if !topic_valid {
             return Err(ClientError::Request(publish));
         }
         self.request_tx.send_async(publish).await?;
@@ -137,11 +139,13 @@ impl AsyncClient {
         S: Into<String>,
         P: Into<Bytes>,
     {
-        let topic = topic.into();
-        let mut publish = Publish::new(&topic, qos, payload, properties);
+        let topic: String = topic.into();
+        let topic_valid = valid_topic(&topic);
+        let topic_bytes = Bytes::from(topic.into_bytes());
+        let mut publish = Publish::new(topic_bytes, qos, payload, properties);
         publish.retain = retain;
         let publish = Request::Publish(publish);
-        if !valid_topic(&topic) {
+        if !topic_valid {
             return Err(ClientError::TryRequest(publish));
         }
         self.request_tx.try_send(publish)?;
@@ -208,11 +212,13 @@ impl AsyncClient {
     where
         S: Into<String>,
     {
-        let topic = topic.into();
-        let mut publish = Publish::new(&topic, qos, payload, properties);
+        let topic: String = topic.into();
+        let topic_valid = valid_topic(&topic);
+        let topic_bytes = Bytes::from(topic.into_bytes());
+        let mut publish = Publish::new(topic_bytes, qos, payload, properties);
         publish.retain = retain;
         let publish = Request::Publish(publish);
-        if !valid_topic(&topic) {
+        if !topic_valid {
             return Err(ClientError::TryRequest(publish));
         }
         self.request_tx.send_async(publish).await?;
@@ -508,11 +514,13 @@ impl Client {
         S: Into<String>,
         P: Into<Bytes>,
     {
-        let topic = topic.into();
-        let mut publish = Publish::new(&topic, qos, payload, properties);
+        let topic: String = topic.into();
+        let topic_valid = valid_topic(&topic);
+        let topic_bytes = Bytes::from(topic.into_bytes());
+        let mut publish = Publish::new(topic_bytes, qos, payload, properties);
         publish.retain = retain;
         let publish = Request::Publish(publish);
-        if !valid_topic(&topic) {
+        if !topic_valid {
             return Err(ClientError::Request(publish));
         }
         self.client.request_tx.send(publish)?;
diff --git a/rumqttc/src/v5/mqttbytes/v5/connect.rs b/rumqttc/src/v5/mqttbytes/v5/connect.rs
index dfef10621..944c3e44d 100644
--- a/rumqttc/src/v5/mqttbytes/v5/connect.rs
+++ b/rumqttc/src/v5/mqttbytes/v5/connect.rs
@@ -371,7 +371,7 @@ impl LastWill {
         retain: bool,
         properties: Option<LastWillProperties>,
     ) -> LastWill {
-        let topic = Bytes::copy_from_slice(topic.into().as_bytes());
+        let topic = Bytes::from(topic.into());
         LastWill {
             topic,
             message: Bytes::from(payload.into()),
diff --git a/rumqttc/src/v5/mqttbytes/v5/publish.rs b/rumqttc/src/v5/mqttbytes/v5/publish.rs
index e2eee772d..ba4ec1bd0 100644
--- a/rumqttc/src/v5/mqttbytes/v5/publish.rs
+++ b/rumqttc/src/v5/mqttbytes/v5/publish.rs
@@ -14,13 +14,13 @@ pub struct Publish {
 }
 
 impl Publish {
-    pub fn new<T: Into<String>, P: Into<Bytes>>(
+    pub fn new<T: Into<Bytes>, P: Into<Bytes>>(
         topic: T,
         qos: QoS,
         payload: P,
         properties: Option<PublishProperties>,
     ) -> Self {
-        let topic = Bytes::copy_from_slice(topic.into().as_bytes());
+        let topic = Bytes::from(topic.into());
         Self {
             qos,
             topic,