diff --git a/src/cli.rs b/src/cli.rs
index c2ba11f..3782ab2 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -34,11 +34,19 @@ struct Args {
     action: Action,
 }
 
-fn convert_kind(kind_arg: &NotationKindArg) -> NotationKind {
-    match kind_arg {
+impl Into<NotationKind> for NotationKindArg {
+    fn into(self) -> NotationKind {
+        (&self).into()
+    }
+}
+
+impl Into<NotationKind> for &NotationKindArg {
+    fn into(self) -> NotationKind {
+        match self {
         NotationKindArg::Iso => NotationKind::Iso,
         NotationKindArg::Uns => NotationKind::Uns,
         NotationKindArg::Alphanumeric => NotationKind::Alphanumeric,
+        }
     }
 }
 
@@ -47,10 +55,10 @@ pub fn run_cli() {
 
     match &args.action {
         Action::Convert { from, to, value } => {
-            let tooth_result = Tooth::from(value, &convert_kind(from));
+            let tooth_result = Tooth::from(value, &from.into());
 
             let output_string = match tooth_result {
-                Ok(tooth) => tooth.to(&convert_kind(to)),
+                Ok(tooth) => tooth.to(&to.into()),
                 Err(err) => err,
             };