diff --git a/sop-java/src/main/java/sop/enums/EncryptAs.java b/sop-java/src/main/java/sop/enums/EncryptAs.java
deleted file mode 100644
index 7e7d4d1..0000000
--- a/sop-java/src/main/java/sop/enums/EncryptAs.java
+++ /dev/null
@@ -1,16 +0,0 @@
-// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-package sop.enums;
-
-public enum EncryptAs {
-    Binary,
-    Text,
-    ;
-
-    @Override
-    public String toString() {
-        return super.toString().toLowerCase();
-    }
-}
diff --git a/sop-java/src/main/kotlin/sop/enums/EncryptAs.kt b/sop-java/src/main/kotlin/sop/enums/EncryptAs.kt
new file mode 100644
index 0000000..0b6aa8e
--- /dev/null
+++ b/sop-java/src/main/kotlin/sop/enums/EncryptAs.kt
@@ -0,0 +1,10 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package sop.enums
+
+enum class EncryptAs {
+    binary,
+    text
+}
diff --git a/sop-java/src/testFixtures/java/sop/testsuite/operation/EncryptDecryptTest.java b/sop-java/src/testFixtures/java/sop/testsuite/operation/EncryptDecryptTest.java
index 0c382dc..9138f64 100644
--- a/sop-java/src/testFixtures/java/sop/testsuite/operation/EncryptDecryptTest.java
+++ b/sop-java/src/testFixtures/java/sop/testsuite/operation/EncryptDecryptTest.java
@@ -142,7 +142,7 @@ public class EncryptDecryptTest extends AbstractSOPTest {
         byte[] ciphertext = sop.encrypt()
                 .withCert(TestData.ALICE_CERT.getBytes(StandardCharsets.UTF_8))
                 .signWith(TestData.ALICE_KEY.getBytes(StandardCharsets.UTF_8))
-                .mode(EncryptAs.Binary)
+                .mode(EncryptAs.binary)
                 .plaintext(message)
                 .getBytes();
 
@@ -173,7 +173,7 @@ public class EncryptDecryptTest extends AbstractSOPTest {
         byte[] ciphertext = sop.encrypt()
                 .withCert(TestData.ALICE_CERT.getBytes(StandardCharsets.UTF_8))
                 .signWith(TestData.ALICE_KEY.getBytes(StandardCharsets.UTF_8))
-                .mode(EncryptAs.Text)
+                .mode(EncryptAs.text)
                 .plaintext(message)
                 .getBytes();