diff --git a/src/rstd/inlining.rs b/src/rstd/inlining.rs
index 573e12e..d501964 100644
--- a/src/rstd/inlining.rs
+++ b/src/rstd/inlining.rs
@@ -17,6 +17,13 @@ pub trait InlineableDeserializer: Sized {
         ok: impl FnOnce(&[u8]) -> A,
         err: impl FnOnce(&[u8]) -> E,
     ) -> Result<(A, Self), E>;
+
+    fn iread_n_const<const N: usize, E>(
+        self,
+        err: impl FnOnce(&[u8]) -> E,
+    ) -> Result<([u8; N], Self), E> {
+        self.iread_n(N, |slice| slice.try_into().unwrap(), err)
+    }
 }
 
 impl<D: ?Sized + Deserializer> InlineableDeserializer for &mut D {