diff --git a/src/ch08-03-hash-maps.md b/src/ch08-03-hash-maps.md
index 5abadbd8a5..b3f9935139 100644
--- a/src/ch08-03-hash-maps.md
+++ b/src/ch08-03-hash-maps.md
@@ -219,7 +219,7 @@ necessarily have to implement your own hasher from scratch;
 [crates.io](https://crates.io/) has libraries shared by other Rust users that
 provide hashers implementing many common hashing algorithms.
 
-[^siphash]: [https://www.131002.net/siphash/siphash.pdf](https://www.131002.net/siphash/siphash.pdf)
+[^siphash]: [https://en.wikipedia.org/wiki/SipHash](https://en.wikipedia.org/wiki/SipHash)
 
 ## Summary