diff --git a/Cargo.toml b/Cargo.toml
index 69b3aa0..23c7742 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,7 +41,7 @@ name = "x25519"
 harness = false
 
 [features]
-default = ["std", "nightly", "u64_backend"]
+default = ["std", "u64_backend"]
 std = ["curve25519-dalek/std"]
 nightly = ["curve25519-dalek/nightly", "clear_on_drop/nightly"]
 u64_backend = ["curve25519-dalek/u64_backend"]