diff --git a/ed25519-dalek/Cargo.toml b/ed25519-dalek/Cargo.toml
index 3245029..2dd9201 100644
--- a/ed25519-dalek/Cargo.toml
+++ b/ed25519-dalek/Cargo.toml
@@ -62,7 +62,7 @@ required-features = ["rand_core"]
 
 [features]
 default = ["fast", "std", "zeroize"]
-alloc = ["curve25519-dalek/alloc", "ed25519/alloc", "serde?/alloc", "zeroize/alloc"]
+alloc = ["curve25519-dalek/alloc", "ed25519/alloc", "serde?/alloc", "zeroize?/alloc"]
 std = ["alloc", "ed25519/std", "serde?/std", "sha2/std"]
 
 asm = ["sha2/asm"]