diff --git a/kbkdf/src/lib.rs b/kbkdf/src/lib.rs
index e805e8e..026681a 100644
--- a/kbkdf/src/lib.rs
+++ b/kbkdf/src/lib.rs
@@ -7,7 +7,6 @@
 
 #![no_std]
 #![cfg_attr(docsrs, feature(doc_cfg))]
-#![recursion_limit = "128"]
 
 #[cfg(feature = "std")]
 extern crate std;
@@ -82,7 +81,7 @@ where
 ///  - K - the expected output length of the newly derived key
 ///  - R - An integer (1 <= r <= 32) that indicates the length of the binary encoding of the counter i
 ///        as an integer in the interval [1, 2r − 1].
-pub trait Kbkdf<Prf, K, R: sealed::R = U32>
+pub trait Kbkdf<Prf, K, R: sealed::R>
 where
     Prf: Mac + KeyInit,
     K: KeySizeUser,
diff --git a/kbkdf/src/sealed.rs b/kbkdf/src/sealed.rs
index afa8213..da2167b 100644
--- a/kbkdf/src/sealed.rs
+++ b/kbkdf/src/sealed.rs
@@ -1,13 +1,12 @@
-    use digest::{
-        consts::{U16, U24, U32, U8},
-        generic_array::typenum::Unsigned,
-    };
+use digest::{
+    consts::{U16, U24, U32, U8},
+    generic_array::typenum::Unsigned,
+};
 
-    /// Marker used to register valid values for R in the KBKDF
-    pub trait R: Unsigned {}
-
-    impl R for U8 {}
-    impl R for U16 {}
-    impl R for U24 {}
-    impl R for U32 {}
+/// Marker used to register valid values for R in the KBKDF
+pub trait R: Unsigned {}
 
+impl R for U8 {}
+impl R for U16 {}
+impl R for U24 {}
+impl R for U32 {}