diff --git a/postgres-types/src/lib.rs b/postgres-types/src/lib.rs
index 59ec4f81..4dd87c71 100644
--- a/postgres-types/src/lib.rs
+++ b/postgres-types/src/lib.rs
@@ -909,7 +909,7 @@ impl<'a> ToSql for &'a str {
 
 impl<'a> ToSql for Cow<'a, str> {
     fn to_sql(&self, ty: &Type, w: &mut BytesMut) -> Result<IsNull, Box<dyn Error + Sync + Send>> {
-        <&str as ToSql>::to_sql(&&self.as_ref(), ty, w)
+        <&str as ToSql>::to_sql(&self.as_ref(), ty, w)
     }
 
     fn accepts(ty: &Type) -> bool {
diff --git a/tokio-postgres/src/config.rs b/tokio-postgres/src/config.rs
index 11148717..eb4e5bdc 100644
--- a/tokio-postgres/src/config.rs
+++ b/tokio-postgres/src/config.rs
@@ -390,19 +390,19 @@ impl Config {
     fn param(&mut self, key: &str, value: &str) -> Result<(), Error> {
         match key {
             "user" => {
-                self.user(&value);
+                self.user(value);
             }
             "password" => {
                 self.password(value);
             }
             "dbname" => {
-                self.dbname(&value);
+                self.dbname(value);
             }
             "options" => {
-                self.options(&value);
+                self.options(value);
             }
             "application_name" => {
-                self.application_name(&value);
+                self.application_name(value);
             }
             "sslmode" => {
                 let mode = match value {
diff --git a/tokio-postgres/src/prepare.rs b/tokio-postgres/src/prepare.rs
index 49397deb..7a616341 100644
--- a/tokio-postgres/src/prepare.rs
+++ b/tokio-postgres/src/prepare.rs
@@ -86,7 +86,7 @@ pub async fn prepare(
     let mut parameters = vec![];
     let mut it = parameter_description.parameters();
     while let Some(oid) = it.next().map_err(Error::parse)? {
-        let type_ = get_type(&client, oid).await?;
+        let type_ = get_type(client, oid).await?;
         parameters.push(type_);
     }
 
@@ -94,13 +94,13 @@ pub async fn prepare(
     if let Some(row_description) = row_description {
         let mut it = row_description.fields();
         while let Some(field) = it.next().map_err(Error::parse)? {
-            let type_ = get_type(&client, field.type_oid()).await?;
+            let type_ = get_type(client, field.type_oid()).await?;
             let column = Column::new(field.name().to_string(), type_);
             columns.push(column);
         }
     }
 
-    Ok(Statement::new(&client, name, parameters, columns))
+    Ok(Statement::new(client, name, parameters, columns))
 }
 
 fn prepare_rec<'a>(
@@ -120,7 +120,7 @@ fn encode(client: &InnerClient, name: &str, query: &str, types: &[Type]) -> Resu
 
     client.with_buf(|buf| {
         frontend::parse(name, query, types.iter().map(Type::oid), buf).map_err(Error::encode)?;
-        frontend::describe(b'S', &name, buf).map_err(Error::encode)?;
+        frontend::describe(b'S', name, buf).map_err(Error::encode)?;
         frontend::sync(buf);
         Ok(buf.split().freeze())
     })
diff --git a/tokio-postgres/src/transaction.rs b/tokio-postgres/src/transaction.rs
index a1aa7611..b72b119b 100644
--- a/tokio-postgres/src/transaction.rs
+++ b/tokio-postgres/src/transaction.rs
@@ -201,7 +201,7 @@ impl<'a> Transaction<'a> {
         I: IntoIterator<Item = P>,
         I::IntoIter: ExactSizeIterator,
     {
-        let statement = statement.__convert().into_statement(&self.client).await?;
+        let statement = statement.__convert().into_statement(self.client).await?;
         bind::bind(self.client.inner(), statement, params).await
     }