diff --git a/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp b/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
index 4f74fc76f37..d3fcb386d2a 100644
--- a/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
+++ b/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
@@ -5202,7 +5202,10 @@ WebIDL::ExceptionOr<GC::Ref<JS::Object>> X25519::export_key(Bindings::KeyFormat
         //    Set the privateKey field to the result of DER-encoding a CurvePrivateKey ASN.1 type, as defined in Section 7 of [RFC8410],
         //    that represents the X25519 private key represented by the [[handle]] internal slot of key
         auto private_key = handle.get<ByteBuffer>();
-        auto data = TRY_OR_THROW_OOM(vm, ::Crypto::PK::wrap_in_private_key_info(private_key, ::Crypto::ASN1::x25519_oid));
+
+        ::Crypto::ASN1::Encoder encoder;
+        TRY_OR_THROW_OOM(vm, encoder.write(private_key));
+        auto data = TRY_OR_THROW_OOM(vm, ::Crypto::PK::wrap_in_private_key_info(encoder.finish(), ::Crypto::ASN1::x25519_oid));
 
         // 3. Let result be a new ArrayBuffer associated with the relevant global object of this [HTML], and containing data.
         result = JS::ArrayBuffer::create(m_realm, data);
diff --git a/Tests/LibWeb/Text/expected/wpt-import/WebCryptoAPI/import_export/okp_importKey_X25519.https.any.txt b/Tests/LibWeb/Text/expected/wpt-import/WebCryptoAPI/import_export/okp_importKey_X25519.https.any.txt
index 5055524d6c9..718fa31ce98 100644
--- a/Tests/LibWeb/Text/expected/wpt-import/WebCryptoAPI/import_export/okp_importKey_X25519.https.any.txt
+++ b/Tests/LibWeb/Text/expected/wpt-import/WebCryptoAPI/import_export/okp_importKey_X25519.https.any.txt
@@ -2,8 +2,7 @@ Harness status: OK
 
 Found 54 tests
 
-46 Pass
-8 Fail
+54 Pass
 Pass	Good parameters: X25519 bits (spki, buffer(44), {name: X25519}, true, [])
 Pass	Good parameters: X25519 bits (spki, buffer(44), X25519, true, [])
 Pass	Good parameters: X25519 bits (jwk, object(kty, crv, x), {name: X25519}, true, [])
@@ -12,26 +11,26 @@ Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(kty, crv, x), {na
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(kty, crv, x), X25519, true, [])
 Pass	Good parameters: X25519 bits (raw, buffer(32), {name: X25519}, true, [])
 Pass	Good parameters: X25519 bits (raw, buffer(32), X25519, true, [])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveKey])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveKey])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveKey])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveKey])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), X25519, true, [deriveKey])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), X25519, true, [deriveKey])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveBits, deriveKey])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveBits, deriveKey])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveBits, deriveKey])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveBits, deriveKey])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits, deriveKey])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), X25519, true, [deriveBits, deriveKey])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits, deriveKey])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), X25519, true, [deriveBits, deriveKey])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveBits])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveBits])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveBits])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveBits])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), X25519, true, [deriveBits])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveBits])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), X25519, true, [deriveBits])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits])
-Fail	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveKey, deriveBits, deriveKey, deriveBits])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits])
+Pass	Good parameters: X25519 bits (pkcs8, buffer(48), X25519, true, [deriveKey, deriveBits, deriveKey, deriveBits])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits])
 Pass	Good parameters: X25519 bits (jwk, object(crv, d, x, kty), X25519, true, [deriveKey, deriveBits, deriveKey, deriveBits])
 Pass	Good parameters with ignored JWK alg: X25519 (jwk, object(crv, d, x, kty), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits])