diff --git a/argon2/Cargo.toml b/argon2/Cargo.toml
index 92ba47d8..dfecf385 100644
--- a/argon2/Cargo.toml
+++ b/argon2/Cargo.toml
@@ -21,7 +21,7 @@ blake2 = { version = "0.10.6", default-features = false }
 
 # optional dependencies
 password-hash = { version = "=0.5.0-pre.0", optional = true }
-zeroize = { version = "1", optional = true }
+zeroize = { version = "1", default-features = false, optional = true }
 
 [dev-dependencies]
 hex-literal = "0.3"