diff --git a/argh_derive/Cargo.toml b/argh_derive/Cargo.toml
index 0c9eb8e..2294c70 100644
--- a/argh_derive/Cargo.toml
+++ b/argh_derive/Cargo.toml
@@ -12,7 +12,7 @@ readme = "README.md"
 proc-macro = true
 
 [dependencies]
-heck = "0.3.1"
+heck = "0.4"
 proc-macro2 = "1.0"
 quote = "1.0"
 syn = "1.0"
diff --git a/argh_derive/src/lib.rs b/argh_derive/src/lib.rs
index 2e5f1ec..7dc5f32 100644
--- a/argh_derive/src/lib.rs
+++ b/argh_derive/src/lib.rs
@@ -13,6 +13,7 @@ use {
         errors::Errors,
         parse_attrs::{FieldAttrs, FieldKind, TypeAttrs},
     },
+    heck::ToKebabCase,
     proc_macro2::{Span, TokenStream},
     quote::{quote, quote_spanned, ToTokens},
     std::{collections::HashMap, str::FromStr},
@@ -184,7 +185,7 @@ impl<'a> StructField<'a> {
                     .long
                     .as_ref()
                     .map(syn::LitStr::value)
-                    .unwrap_or_else(|| heck::KebabCase::to_kebab_case(&*name.to_string()));
+                    .unwrap_or_else(|| name.to_string().to_kebab_case());
                 if long_name == "help" {
                     errors.err(field, "Custom `--help` flags are not supported.");
                 }