diff --git a/src/lib.rs b/src/lib.rs
index 943413fd01..213037b7e5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -295,7 +295,7 @@ impl<'a, T> fmt::Debug for Exclusive<'a, T>
 where
     T: fmt::Debug,
 {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         (**self).fmt(f)
     }
 }
@@ -304,7 +304,7 @@ impl<'a, T> fmt::Display for Exclusive<'a, T>
 where
     T: fmt::Display,
 {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         (**self).fmt(f)
     }
 }