diff --git a/src/ch15-05-interior-mutability.md b/src/ch15-05-interior-mutability.md
index 5210ff3b83..c730d02bf3 100644
--- a/src/ch15-05-interior-mutability.md
+++ b/src/ch15-05-interior-mutability.md
@@ -140,7 +140,7 @@ pub trait Messenger {
     fn send(&self, msg: &str);
 }
 
-pub struct LimitTracker<'a, T: 'a + Messenger> {
+pub struct LimitTracker<'a, T: Messenger> {
     messenger: &'a T,
     value: usize,
     max: usize,