diff --git a/loader/curve25519-dalek-loader/Cargo.toml b/loader/curve25519-dalek-loader/Cargo.toml
index 50da01d54..fcc7b1c9f 100644
--- a/loader/curve25519-dalek-loader/Cargo.toml
+++ b/loader/curve25519-dalek-loader/Cargo.toml
@@ -9,6 +9,7 @@ authors = [
     "Isis Lovecruft <isis@patternsinthevoid.net>",
     "Henry de Valence <hdevalence@hdevalence.ca>",
 ]
+edition = "2015"
 readme = "README.md"
 license = "BSD-3-Clause"
 repository = "https://github.com/dalek-cryptography/curve25519-dalek"