diff --git a/Cargo.toml b/Cargo.toml
index 5443bf5..7f54015 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,11 +1,11 @@
 [package]
 name = "hex_fmt"
 description = "Formatting and shortening byte slices as hexadecimal strings"
-version = "0.2.0"
+version = "0.3.0"
 license = "MIT/Apache-2.0"
 authors = ["Andreas Fackler <AndreasFackler@gmx.de>"]
 repository = "https://github.com/poanetwork/hex_fmt"
 readme = "README.md"
 keywords = ["format", "hex", "display", "debug"]
-categories = ["value-formatting", "development-tools::debugging"]
+categories = ["value-formatting", "development-tools::debugging", "no-std"]
 edition = "2018"
diff --git a/src/lib.rs b/src/lib.rs
index 75aebff..93d358f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -37,7 +37,9 @@
 //! assert_eq!("[0A.., 1B.., 2C..]", &format!("{:<4X}", HexList(list)));
 //! ```
 
-use std::fmt::{Alignment, Debug, Display, Formatter, LowerHex, Result, UpperHex, Write};
+#![cfg_attr(not(test), no_std)]
+
+use core::fmt::{Alignment, Debug, Display, Formatter, LowerHex, Result, UpperHex, Write};
 
 const ELLIPSIS: &str = "..";