diff --git a/src/error.rs b/src/error.rs
index b3da1b84..289cbef2 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -14,7 +14,7 @@ use serde_urlencoded::ser::Error as SerdeUrlEncodedSerializeError;
 pub struct Error(pub(crate) InnerError);
 
 impl Display for Error {
-    fn fmt(&self, f: &mut Formatter) -> FmtResult {
+    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
         let message = match self.0 {
             InnerError::AuthenticationRequired => "The queried endpoint requires authentication but was called with an anonymous client.",
             InnerError::Hyper(_) => "An HTTP error occurred.",
diff --git a/src/lib.rs b/src/lib.rs
index 415be2ea..5275c05e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -75,6 +75,7 @@
 //! # ;
 //! ```
 
+#![warn(rust_2018_idioms)]
 #![deny(
     missing_copy_implementations,
     missing_debug_implementations,