diff --git a/crypto/dalek-ff-group/Cargo.toml b/crypto/dalek-ff-group/Cargo.toml
index d8a92194c..29b8806c2 100644
--- a/crypto/dalek-ff-group/Cargo.toml
+++ b/crypto/dalek-ff-group/Cargo.toml
@@ -29,7 +29,7 @@ digest = { version = "0.10", default-features = false }
 ff = { version = "0.13", default-features = false, features = ["bits"] }
 group = { version = "0.13", default-features = false }
 
-crypto-bigint = { version = "0.5", default-features = false }
+crypto-bigint = { version = "0.5", default-features = false, features = ["zeroize"] }
 
 curve25519-dalek = { version = ">= 4.0, < 4.2", default-features = false, features = ["alloc", "zeroize", "digest", "group", "precomputed-tables"] }