diff --git a/keyfork/src/cli/mnemonic.rs b/keyfork/src/cli/mnemonic.rs
index 2fa9b88..685e3a2 100644
--- a/keyfork/src/cli/mnemonic.rs
+++ b/keyfork/src/cli/mnemonic.rs
@@ -1,5 +1,5 @@
 use super::Keyfork;
-use clap::{Parser, Subcommand, ValueEnum};
+use clap::{Parser, Subcommand, ValueEnum, builder::PossibleValue};
 use std::fmt::Display;
 
 #[derive(Clone, Debug, Default)]
@@ -10,6 +10,20 @@ pub enum SeedSize {
     Bits256,
 }
 
+// custom impl to override names in ValueEnum
+impl ValueEnum for SeedSize {
+    fn value_variants<'a>() -> &'a [Self] {
+        &[Self::Bits128, Self::Bits256]
+    }
+
+    fn to_possible_value(&self) -> Option<PossibleValue> {
+        Some(PossibleValue::new(match self {
+            SeedSize::Bits128 => "128",
+            SeedSize::Bits256 => "256",
+        }))
+    }
+}
+
 #[derive(thiserror::Error, Debug, Clone)]
 pub enum SeedSizeError {
     #[error("Expected one of 128, 256")]