diff --git a/key/src/main/java/net/kyori/adventure/key/Key.java b/key/src/main/java/net/kyori/adventure/key/Key.java
index ba6c9204c..82fa1e276 100644
--- a/key/src/main/java/net/kyori/adventure/key/Key.java
+++ b/key/src/main/java/net/kyori/adventure/key/Key.java
@@ -55,7 +55,7 @@
  *
  * @since 4.0.0
  */
-public interface Key extends Comparable<Key>, Examinable {
+public interface Key extends Comparable<Key>, Examinable, Namespaced {
   /**
    * The namespace for Minecraft.
    *