diff --git a/src/lib.rs b/src/lib.rs
index e3a6bc5..899f5c0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,7 +20,7 @@ use thiserror::Error;
 mod private;
 mod public;
 
-const RSA_OID: [u64; 7] = [1, 2, 840, 113549, 1, 1, 1];
+const RSA_OID: [u64; 7] = [1, 2, 840, 113_549, 1, 1, 1];
 
 /// Extensions to keys for formatting and reading PKCS1 and PKCS8 PEM strings
 pub trait KeyExt {
diff --git a/src/private.rs b/src/private.rs
index f07b4ef..8e9ab27 100644
--- a/src/private.rs
+++ b/src/private.rs
@@ -64,7 +64,7 @@ impl KeyExt for RSAPrivateKey {
         let data = pem::parse(pem).map_err(|_| KeyError::Pem)?;
 
         if data.tag != "PRIVATE KEY" {
-            return Err(KeyError::Kind.into());
+            return Err(KeyError::Kind);
         }
 
         let expected_oid = yasna::models::ObjectIdentifier::from_slice(&RSA_OID);
@@ -124,7 +124,7 @@ impl KeyExt for RSAPrivateKey {
         let data = pem::parse(pem).map_err(|_| KeyError::Pem)?;
 
         if data.tag != "RSA PRIVATE KEY" {
-            return Err(KeyError::Kind.into());
+            return Err(KeyError::Kind);
         }
 
         let pkey = parse_pkcs1(&data.contents)?;
diff --git a/src/public.rs b/src/public.rs
index 4252da7..6e094c2 100644
--- a/src/public.rs
+++ b/src/public.rs
@@ -32,7 +32,7 @@ impl KeyExt for RSAPublicKey {
         let data = pem::parse(pem).map_err(|_| KeyError::Pem)?;
 
         if data.tag != "PUBLIC KEY" {
-            return Err(KeyError::Kind.into());
+            return Err(KeyError::Kind);
         }
 
         let expected_oid = yasna::models::ObjectIdentifier::from_slice(&RSA_OID);
@@ -79,7 +79,7 @@ impl KeyExt for RSAPublicKey {
         let data = pem::parse(pem).map_err(|_| KeyError::Pem)?;
 
         if data.tag != "RSA PUBLIC KEY" {
-            return Err(KeyError::Kind.into());
+            return Err(KeyError::Kind);
         }
 
         let pkey = parse_pkcs1(&data.contents)?;