diff --git a/Cargo.toml b/Cargo.toml
index a53c4ea..2c96e61 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ repository = "https://github.com/unicode-rs/rust-caseless"
 license = "MIT"
 
 [dependencies]
-unicode-normalization = "0.1"
+unicode-normalization = { version = "0.1", default-features = false }
 
 [workspace]
 members = [
diff --git a/src/lib.rs b/src/lib.rs
index 6533105..52c3a53 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,8 @@
+#![no_std]
+extern crate alloc;
+
+use alloc::string::String;
+
 use unicode_normalization::UnicodeNormalization;
 
 extern crate unicode_normalization;