diff --git a/src/kdf_chain.rs b/src/kdf_chain.rs
index 7e41995..5b4a10d 100644
--- a/src/kdf_chain.rs
+++ b/src/kdf_chain.rs
@@ -3,7 +3,7 @@ use hmac::{Hmac, Mac, NewMac};
 #[cfg(feature = "ring")]
 use ring_compat::digest::Sha512;
 
-#[cfg(feature = "default")]
+#[cfg(not(feature = "ring"))]
 use sha2::Sha512;
 
 use core::convert::TryInto;
diff --git a/src/kdf_root.rs b/src/kdf_root.rs
index cc971f3..2f75b98 100644
--- a/src/kdf_root.rs
+++ b/src/kdf_root.rs
@@ -4,7 +4,7 @@ use hkdf::Hkdf;
 #[cfg(feature = "ring")]
 use ring_compat::digest::Sha512;
 
-#[cfg(feature = "default")]
+#[cfg(not(feature = "ring"))]
 use sha2::Sha512;
 
 use core::convert::TryInto;