diff --git a/src/lib.rs b/src/lib.rs
index de05f8b..70e8ef0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -251,9 +251,9 @@ extern crate clear_on_drop;
 extern crate curve25519_dalek;
 extern crate failure;
 extern crate rand;
-extern crate sha2;
 #[cfg(feature = "serde")]
 extern crate serde;
+extern crate sha2;
 
 mod constants;
 mod ed25519;