diff --git a/Cargo.lock b/Cargo.lock
index 103a39a..22c9b06 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,7 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "akin"
-version = "0.3.3"
+version = "0.4.0"
diff --git a/src/lib.rs b/src/lib.rs
index 289d657..f2969db 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,11 @@
-use std::fmt::Write;
+#![no_std]
+
+use core::fmt::Write;
+
+extern crate alloc;
+use alloc::string::{String, ToString};
+use alloc::vec::Vec;
+use alloc::format;
 
 use proc_macro::{Delimiter, Spacing, TokenTree};
 
@@ -515,7 +522,7 @@ impl<'c> Chunk<'c> {
 
         let mut text_start = 0usize;
         let chopped = prefix.match_indices(var_name).map(move |(idx, v)| (idx, v.len(), var_values));
-        let chopped = chopped.chain(std::iter::once((prefix.len(), 0, suffix_variants)));
+        let chopped = chopped.chain(core::iter::once((prefix.len(), 0, suffix_variants)));
         let chopped = chopped.map(move |(var_start, var_len, values)| {
             let new_prefix = &prefix[text_start..var_start];
             text_start = var_start + var_len;
@@ -580,4 +587,4 @@ fn fold_tt(a: &mut String, tt: TokenTree, prev: &mut Option<TokenTree>) {
     *prev = Some(tt);
 }
 
-type Map<T, S> = std::collections::BTreeMap<T, S>;
+type Map<T, S> = alloc::collections::BTreeMap<T, S>;