diff --git a/Cargo.toml b/Cargo.toml
index d36fba9b8..d036b229e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,6 +45,7 @@ rand_core = "0.6"
 serde_cbor = "0.10.0"
 serde_test = "1.0.19"
 bincode = "1.3.3"
+hex_lit = "0.1.1"
 
 [target.wasm32-unknown-unknown.dev-dependencies]
 wasm-bindgen-test = "0.3"
diff --git a/src/key.rs b/src/key.rs
index 3e59b0149..85482e05f 100644
--- a/src/key.rs
+++ b/src/key.rs
@@ -1527,6 +1527,8 @@ impl<'de> serde::Deserialize<'de> for XOnlyPublicKey {
 mod test {
     use core::str::FromStr;
 
+    #[cfg(not(secp256k1_fuzz))]
+    use hex_lit::hex;
     #[cfg(feature = "rand")]
     use rand::{self, rngs::mock::StepRng, RngCore};
     use serde_test::{Configure, Token};
@@ -1537,15 +1539,6 @@ mod test {
     use crate::Error::{InvalidPublicKey, InvalidSecretKey};
     use crate::{constants, from_hex, to_hex, Scalar};
 
-    #[cfg(not(secp256k1_fuzz))]
-    macro_rules! hex {
-        ($hex:expr) => {{
-            let mut result = vec![0; $hex.len() / 2];
-            from_hex($hex, &mut result).expect("valid hex string");
-            result
-        }};
-    }
-
     #[test]
     fn skey_from_slice() {
         let sk = SecretKey::from_slice(&[1; 31]);
diff --git a/src/lib.rs b/src/lib.rs
index 4e5dc7168..87a45c706 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -508,19 +508,12 @@ pub(crate) fn random_32_bytes<R: rand::Rng + ?Sized>(rng: &mut R) -> [u8; 32] {
 mod tests {
     use std::str::FromStr;
 
+    use hex_lit::hex;
     #[cfg(target_arch = "wasm32")]
     use wasm_bindgen_test::wasm_bindgen_test as test;
 
     use super::*;
 
-    macro_rules! hex {
-        ($hex:expr) => {{
-            let mut result = vec![0; $hex.len() / 2];
-            from_hex($hex, &mut result).expect("valid hex string");
-            result
-        }};
-    }
-
     #[test]
     #[cfg(all(feature = "rand", feature = "std"))]
     // In rustc 1.72 this Clippy lint was pulled out of clippy and into rustc, and
@@ -678,17 +671,17 @@ mod tests {
 
     #[test]
     fn signature_display() {
-        let hex_str = "3046022100839c1fbc5304de944f697c9f4b1d01d1faeba32d751c0f7acb21ac8a0f436a72022100e89bd46bb3a5a62adc679f659b7ce876d83ee297c7a5587b2011c4fcc72eab45";
-        let byte_str = hex!(hex_str);
+        const HEX_STR: &str = "3046022100839c1fbc5304de944f697c9f4b1d01d1faeba32d751c0f7acb21ac8a0f436a72022100e89bd46bb3a5a62adc679f659b7ce876d83ee297c7a5587b2011c4fcc72eab45";
+        let byte_str = hex!(HEX_STR);
 
         assert_eq!(
             ecdsa::Signature::from_der(&byte_str).expect("byte str decode"),
-            ecdsa::Signature::from_str(hex_str).expect("byte str decode")
+            ecdsa::Signature::from_str(HEX_STR).expect("byte str decode")
         );
 
-        let sig = ecdsa::Signature::from_str(hex_str).expect("byte str decode");
-        assert_eq!(&sig.to_string(), hex_str);
-        assert_eq!(&format!("{:?}", sig), hex_str);
+        let sig = ecdsa::Signature::from_str(HEX_STR).expect("byte str decode");
+        assert_eq!(&sig.to_string(), HEX_STR);
+        assert_eq!(&format!("{:?}", sig), HEX_STR);
 
         assert!(ecdsa::Signature::from_str(
             "3046022100839c1fbc5304de944f697c9f4b1d01d1faeba32d751c0f7acb21ac8a0f436a\