diff --git a/src/lib.rs b/src/lib.rs
index 56c932a..1cc0428 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -33,7 +33,7 @@ extern crate alloc;
 
 extern crate bitcoin_hashes;
 
-#[cfg(feature = "alloc")]
+#[cfg(any(feature = "alloc", feature = "std"))]
 extern crate unicode_normalization;
 
 #[cfg(feature = "rand")]
@@ -45,14 +45,13 @@ pub extern crate serde;
 
 use core::{fmt, str};
 
-#[cfg(feature = "alloc")]
 use alloc::borrow::Cow;
 #[cfg(feature = "std")]
 use std::error;
 
 use bitcoin_hashes::{sha256, Hash};
 
-#[cfg(feature = "alloc")]
+#[cfg(any(feature = "alloc", feature = "std"))]
 use unicode_normalization::UnicodeNormalization;
 
 #[cfg(feature = "zeroize")]
@@ -95,7 +94,7 @@ impl AmbiguousLanguages {
 	}
 
 	/// Returns a vector of the possible languages.
-	#[cfg(feature = "alloc")]
+	#[cfg(any(feature = "alloc", feature = "std"))]
 	pub fn to_vec(&self) -> Vec<Language> {
 		self.iter().collect()
 	}
@@ -183,7 +182,7 @@ impl Mnemonic {
 	/// Performing this on a [Cow] means that all allocations for normalization
 	/// can be avoided for languages without special UTF8 characters.
 	#[inline]
-	#[cfg(feature = "alloc")]
+	#[cfg(any(feature = "alloc", feature = "std"))]
 	pub fn normalize_utf8_cow<'a>(cow: &mut Cow<'a, str>) {
 		let is_nfkd = unicode_normalization::is_nfkd_quick(cow.as_ref().chars());
 		if is_nfkd != unicode_normalization::IsNormalized::Yes {
@@ -506,7 +505,7 @@ impl Mnemonic {
 	}
 
 	/// Parse a mnemonic in the given language.
-	#[cfg(feature = "alloc")]
+	#[cfg(any(feature = "alloc", feature = "std"))]
 	pub fn parse_in<'a, S: Into<Cow<'a, str>>>(
 		language: Language,
 		s: S,
@@ -517,7 +516,7 @@ impl Mnemonic {
 	}
 
 	/// Parse a mnemonic and detect the language from the enabled languages.
-	#[cfg(feature = "alloc")]
+	#[cfg(any(feature = "alloc", feature = "std"))]
 	pub fn parse<'a, S: Into<Cow<'a, str>>>(s: S) -> Result<Mnemonic, Error> {
 		let mut cow = s.into();
 		Mnemonic::normalize_utf8_cow(&mut cow);
@@ -547,7 +546,7 @@ impl Mnemonic {
 	}
 
 	/// Convert to seed bytes.
-	#[cfg(feature = "alloc")]
+	#[cfg(any(feature = "alloc", feature = "std"))]
 	pub fn to_seed<'a, P: Into<Cow<'a, str>>>(&self, passphrase: P) -> [u8; 64] {
 		let normalized_passphrase = {
 			let mut cow = passphrase.into();
@@ -596,7 +595,7 @@ impl Mnemonic {
 	}
 
 	/// Convert the mnemonic back to the entropy used to generate it.
-	#[cfg(feature = "alloc")]
+	#[cfg(any(feature = "alloc", feature = "std"))]
 	pub fn to_entropy(&self) -> Vec<u8> {
 		let (arr, len) = self.to_entropy_array();
 		arr[0..len].to_vec()
@@ -619,11 +618,11 @@ impl str::FromStr for Mnemonic {
 	type Err = Error;
 
 	fn from_str(s: &str) -> Result<Mnemonic, Error> {
-		#[cfg(feature = "alloc")]
+		#[cfg(any(feature = "alloc", feature = "std"))]
 		{
 			Mnemonic::parse(s)
 		}
-		#[cfg(not(feature = "std"))]
+		#[cfg(all(not(feature = "alloc"), not(feature = "std")))]
 		{
 			Mnemonic::parse_normalized(s)
 		}