diff --git a/modules/rdf/rdf.module b/modules/rdf/rdf.module
index 01a3f8c7af724f11a486dc4bdc416ce5c5a5d4e5..34f7dac2db73e405f49b8424d916fa3a600e02b1 100644
--- a/modules/rdf/rdf.module
+++ b/modules/rdf/rdf.module
@@ -70,6 +70,28 @@ function rdf_help($path, $arg) {
  */
 define('RDF_DEFAULT_BUNDLE', '');
 
+/**
+ * Implements hook_rdf_namespaces().
+ */
+function rdf_rdf_namespaces() {
+  return array(
+    'admin'    => 'http://webns.net/mvcb/',
+    'content'  => 'http://purl.org/rss/1.0/modules/content/',
+    'dc'       => 'http://purl.org/dc/terms/',
+    'foaf'     => 'http://xmlns.com/foaf/0.1/',
+    'owl'      => 'http://www.w3.org/2002/07/owl#',
+    'rdf'      => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
+    'rdfs'     => 'http://www.w3.org/2000/01/rdf-schema#',
+    'rss'      => 'http://purl.org/rss/1.0/',
+    'tags'     => 'http://www.holygoat.co.uk/owl/redwood/0.1/tags/',
+    'sioc'     => 'http://rdfs.org/sioc/ns#',
+    'sioct'    => 'http://rdfs.org/sioc/types#',
+    'ctag'     => 'http://commontag.org/ns#',
+    'skos'     => 'http://www.w3.org/2004/02/skos/core#',
+    'xsd'      => 'http://www.w3.org/2001/XMLSchema#',
+  );
+}
+
 /**
  * Returns the mapping for attributes of a given type/bundle pair.
  *
diff --git a/modules/system/system.module b/modules/system/system.module
index c56cb11dba383378c724da8dab4af1a0784a3a2a..e0500e70f49dfb4f2257564d62c0c28350e1052c 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -232,28 +232,6 @@ function system_permission() {
   );
 }
 
-/**
- * Implements hook_rdf_namespaces().
- */
-function system_rdf_namespaces() {
-  return array(
-    'admin'    => 'http://webns.net/mvcb/',
-    'content'  => 'http://purl.org/rss/1.0/modules/content/',
-    'dc'       => 'http://purl.org/dc/terms/',
-    'foaf'     => 'http://xmlns.com/foaf/0.1/',
-    'owl'      => 'http://www.w3.org/2002/07/owl#',
-    'rdf'      => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
-    'rdfs'     => 'http://www.w3.org/2000/01/rdf-schema#',
-    'rss'      => 'http://purl.org/rss/1.0/',
-    'tags'     => 'http://www.holygoat.co.uk/owl/redwood/0.1/tags/',
-    'sioc'     => 'http://rdfs.org/sioc/ns#',
-    'sioct'    => 'http://rdfs.org/sioc/types#',
-    'ctag'     => 'http://commontag.org/ns#',
-    'skos'     => 'http://www.w3.org/2004/02/skos/core#',
-    'xsd'      => 'http://www.w3.org/2001/XMLSchema#',
-  );
-}
-
 /**
  * Implements hook_hook_info().
  */