diff --git a/lettre/src/lib.rs b/lettre/src/lib.rs
index 0994f44..7101e8e 100644
--- a/lettre/src/lib.rs
+++ b/lettre/src/lib.rs
@@ -5,9 +5,9 @@
 //!
 
 #![doc(html_root_url = "https://docs.rs/lettre/0.8.0")]
-#![deny(missing_docs, missing_debug_implementations, missing_copy_implementations,
-        trivial_casts, trivial_numeric_casts, unsafe_code, unstable_features,
-        unused_import_braces, unused_qualifications)]
+#![deny(missing_docs, missing_debug_implementations, missing_copy_implementations, trivial_casts,
+        trivial_numeric_casts, unsafe_code, unstable_features, unused_import_braces,
+        unused_qualifications)]
 #[cfg(feature = "smtp-transport")]
 extern crate base64;
 #[cfg(feature = "smtp-transport")]
diff --git a/lettre/src/smtp/extension.rs b/lettre/src/smtp/extension.rs
index 65dbd52..a83e913 100644
--- a/lettre/src/smtp/extension.rs
+++ b/lettre/src/smtp/extension.rs
@@ -74,10 +74,10 @@ pub enum Extension {
 impl Display for Extension {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         match *self {
-            Extension::EightBitMime => write!(f, "{}", "8BITMIME"),
-            Extension::SmtpUtfEight => write!(f, "{}", "SMTPUTF8"),
-            Extension::StartTls => write!(f, "{}", "STARTTLS"),
-            Extension::Authentication(ref mechanism) => write!(f, "{} {}", "AUTH", mechanism),
+            Extension::EightBitMime => write!(f, "8BITMIME"),
+            Extension::SmtpUtfEight => write!(f, "SMTPUTF8"),
+            Extension::StartTls => write!(f, "STARTTLS"),
+            Extension::Authentication(ref mechanism) => write!(f, "AUTH {}", mechanism),
         }
     }
 }
diff --git a/lettre_email/src/lib.rs b/lettre_email/src/lib.rs
index 16a1b70..5eded44 100644
--- a/lettre_email/src/lib.rs
+++ b/lettre_email/src/lib.rs
@@ -2,9 +2,9 @@
 //!
 
 #![doc(html_root_url = "https://docs.rs/lettre_email/0.8.0")]
-#![deny(missing_docs, missing_debug_implementations, missing_copy_implementations,
-        trivial_casts, trivial_numeric_casts, unsafe_code, unstable_features,
-        unused_import_braces, unused_qualifications)]
+#![deny(missing_docs, missing_debug_implementations, missing_copy_implementations, trivial_casts,
+        trivial_numeric_casts, unsafe_code, unstable_features, unused_import_braces,
+        unused_qualifications)]
 
 extern crate base64;
 extern crate email as email_format;