diff --git a/sop-java/src/main/java/sop/enums/ArmorLabel.java b/sop-java/src/main/java/sop/enums/ArmorLabel.java
deleted file mode 100644
index bb97e84..0000000
--- a/sop-java/src/main/java/sop/enums/ArmorLabel.java
+++ /dev/null
@@ -1,19 +0,0 @@
-// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-package sop.enums;
-
-public enum ArmorLabel {
-    Auto,
-    Sig,
-    Key,
-    Cert,
-    Message,
-    ;
-
-    @Override
-    public String toString() {
-        return super.toString().toLowerCase();
-    }
-}
diff --git a/sop-java/src/main/kotlin/sop/enums/ArmorLabel.kt b/sop-java/src/main/kotlin/sop/enums/ArmorLabel.kt
new file mode 100644
index 0000000..8b4e2cd
--- /dev/null
+++ b/sop-java/src/main/kotlin/sop/enums/ArmorLabel.kt
@@ -0,0 +1,14 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package sop.enums
+
+@Deprecated("Use of armor labels is deprecated.")
+enum class ArmorLabel {
+    auto,
+    sig,
+    key,
+    cert,
+    message
+}