diff --git a/src/doc/guide.md b/src/doc/guide.md
index a7a6ab545b6..871728ef3d7 100644
--- a/src/doc/guide.md
+++ b/src/doc/guide.md
@@ -1060,7 +1060,6 @@ you create a new type that's a synonym for another one:
 
 ```
 struct Inches(int);
-struct Centimeters(int);
 
 let length = Inches(10);