diff --git a/pgpainless-core/src/main/java/org/pgpainless/algorithm/RevocationStateType.java b/pgpainless-core/src/main/java/org/pgpainless/algorithm/RevocationStateType.kt
similarity index 68%
rename from pgpainless-core/src/main/java/org/pgpainless/algorithm/RevocationStateType.java
rename to pgpainless-core/src/main/java/org/pgpainless/algorithm/RevocationStateType.kt
index d1757255..bf18e27f 100644
--- a/pgpainless-core/src/main/java/org/pgpainless/algorithm/RevocationStateType.java
+++ b/pgpainless-core/src/main/java/org/pgpainless/algorithm/RevocationStateType.kt
@@ -1,11 +1,10 @@
-// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
 //
 // SPDX-License-Identifier: Apache-2.0
 
-package org.pgpainless.algorithm;
-
-public enum RevocationStateType {
+package org.pgpainless.algorithm
 
+enum class RevocationStateType {
     /**
      * Certificate is not revoked.
      */
@@ -20,4 +19,4 @@ public enum RevocationStateType {
      * Certificate is revoked with a hard revocation.
      */
     hardRevoked
-}
+}
\ No newline at end of file