diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76c6288..1a47451 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Fixed
 - Mapping with multiple sources linked to another mapping with multiple sources only resulted in half of 
 Referencing Objects Maps.
+- Override `rmlt` and `comp` namespaces.
 
 ## [1.6.0] - 2023-08-22
 
diff --git a/lib/namespaces.js b/lib/namespaces.js
index 744e65a..0e60633 100644
--- a/lib/namespaces.js
+++ b/lib/namespaces.js
@@ -2,8 +2,10 @@
 // Unknown prefixes can be added here, and "wrong" prefixes can be overridden
 
 const _namespaces = require('prefix-ns').asMap();
+_namespaces['comp'] = 'http://semweb.mmlab.be/ns/rml-compression#';
 _namespaces['idlab-fn'] = 'http://example.com/idlab/function/';
 _namespaces['rml'] = 'http://semweb.mmlab.be/ns/rml#'; // this one is the only official one for now, but prefix.cc returns the wrong one.
+_namespaces['rmlt'] = 'http://semweb.mmlab.be/ns/rml-target#';
 _namespaces['dc'] = 'http://purl.org/dc/terms/';
 _namespaces['ql'] = 'http://semweb.mmlab.be/ns/ql#';
 _namespaces['idsa'] = 'https://w3id.org/idsa/core/';