diff --git a/key/src/main/java/net/kyori/adventure/key/KeyPattern.java b/key/src/main/java/net/kyori/adventure/key/KeyPattern.java
index 73f74e9f9..7d3594ad1 100644
--- a/key/src/main/java/net/kyori/adventure/key/KeyPattern.java
+++ b/key/src/main/java/net/kyori/adventure/key/KeyPattern.java
@@ -46,7 +46,7 @@
    *
    * @since 5.0.0
    */
-  @RegExp String NAMESPACE_PATTERN = "^(?!\\.\\.$)[a-z0-9_.-]+$";
+  @RegExp String NAMESPACE_PATTERN = "(?!\\.\\.(?:$|:))[a-z0-9_.-]+";
   /**
    * The pattern for values.
    *