diff --git a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-24/src/main.rs b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-24/src/main.rs
index 2937b194ca..ca3cf86d21 100644
--- a/listings/ch10-generic-types-traits-and-lifetimes/listing-10-24/src/main.rs
+++ b/listings/ch10-generic-types-traits-and-lifetimes/listing-10-24/src/main.rs
@@ -4,7 +4,7 @@ struct ImportantExcerpt<'a> {
 
 fn main() {
     let novel = String::from("Call me Ishmael. Some years ago...");
-    let first_sentence = novel.split('.').next().expect("Could not find a '.'");
+    let first_sentence = novel.split('.').next().unwrap();
     let i = ImportantExcerpt {
         part: first_sentence,
     };
diff --git a/listings/ch10-generic-types-traits-and-lifetimes/no-listing-10-lifetimes-on-methods/src/main.rs b/listings/ch10-generic-types-traits-and-lifetimes/no-listing-10-lifetimes-on-methods/src/main.rs
index b8222308d1..c04ec38236 100644
--- a/listings/ch10-generic-types-traits-and-lifetimes/no-listing-10-lifetimes-on-methods/src/main.rs
+++ b/listings/ch10-generic-types-traits-and-lifetimes/no-listing-10-lifetimes-on-methods/src/main.rs
@@ -21,7 +21,7 @@ impl<'a> ImportantExcerpt<'a> {
 
 fn main() {
     let novel = String::from("Call me Ishmael. Some years ago...");
-    let first_sentence = novel.split('.').next().expect("Could not find a '.'");
+    let first_sentence = novel.split('.').next().unwrap();
     let i = ImportantExcerpt {
         part: first_sentence,
     };