diff --git a/sec1/src/traits.rs b/sec1/src/traits.rs
index ce72ad3b..82d3f7dc 100644
--- a/sec1/src/traits.rs
+++ b/sec1/src/traits.rs
@@ -11,7 +11,7 @@ use {crate::LineEnding, alloc::string::String, der::pem::PemLabel};
 #[cfg(feature = "pkcs8")]
 use {
     crate::{EcPrivateKey, ALGORITHM_OID},
-    der::Decode,
+    der::{asn1::OctetStringRef, Decode},
 };
 
 #[cfg(feature = "std")]
@@ -100,6 +100,8 @@ where
             parameters: params_oid.as_ref().map(Into::into),
         };
 
+        let private_key = OctetStringRef::new(private_key)?;
+
         Ok(Self::try_from(pkcs8::PrivateKeyInfo {
             algorithm,
             private_key,
@@ -115,7 +117,8 @@ impl<T: pkcs8::EncodePrivateKey> EncodeEcPrivateKey for T {
         let pkcs8_key = pkcs8::PrivateKeyInfo::from_der(doc.as_bytes())?;
         pkcs8_key.algorithm.assert_algorithm_oid(ALGORITHM_OID)?;
 
-        let mut pkcs1_key = EcPrivateKey::from_der(pkcs8_key.private_key)?;
+        // TODO: untested
+        let mut pkcs1_key = EcPrivateKey::from_der(pkcs8_key.private_key.as_bytes())?;
         pkcs1_key.parameters = Some(pkcs8_key.algorithm.parameters_oid()?.into());
         pkcs1_key.try_into()
     }