diff --git a/src/doc/book/strings.md b/src/doc/book/strings.md
index 751619d544a4a..68c7235975e8c 100644
--- a/src/doc/book/strings.md
+++ b/src/doc/book/strings.md
@@ -39,7 +39,7 @@ The second, with a `\`, trims the spaces and the newline:
 
 ```rust
 let s = "foo\
-    bar"; 
+    bar";
 
 assert_eq!("foobar", s);
 ```