diff --git a/Cargo.lock b/Cargo.lock
index 64f2898..4141e2d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1786,6 +1786,7 @@ dependencies = [
  "pbkdf2",
  "serde_json",
  "sha2",
+ "smex",
 ]
 
 [[package]]
diff --git a/crates/util/keyfork-mnemonic-util/Cargo.toml b/crates/util/keyfork-mnemonic-util/Cargo.toml
index cfc8c40..3707884 100644
--- a/crates/util/keyfork-mnemonic-util/Cargo.toml
+++ b/crates/util/keyfork-mnemonic-util/Cargo.toml
@@ -6,12 +6,17 @@ repository = "https://git.distrust.co/public/keyfork"
 edition = "2021"
 license = "MIT"
 
+[features]
+default = []
+bin = ["smex"]
+
 [dependencies]
 # Included in rust
 sha2 = "0.10.7"
 
 hmac = "0.12.1"
 pbkdf2 = "0.12.2"
+smex = { version = "0.1.0", path = "../smex", optional = true }
 
 [dev-dependencies]
 bip39 = "2.0.0"