diff --git a/nomad/app/flask/dcat/mapping.py b/nomad/app/flask/dcat/mapping.py
index 5cce7a61817f48e1d9454a7733abd7d72f6f89bf..feef5f2bd15b1a771859e9962dd642b3baffe87a 100644
--- a/nomad/app/flask/dcat/mapping.py
+++ b/nomad/app/flask/dcat/mapping.py
@@ -40,12 +40,12 @@ def get_optional_entry_prop(entry, name):
 class Mapping():
     def __init__(self):
         self.g = Graph()
-        self.g.namespace_manager.bind('rdf', RDF)
-        self.g.namespace_manager.bind('dcat', DCAT)
-        self.g.namespace_manager.bind('dct', DCT)
-        self.g.namespace_manager.bind('vcard', VCARD)
-        self.g.namespace_manager.bind('foaf', FOAF)
-        self.g.namespace_manager.bind('hydra', HYDRA)
+        self.g.bind('rdf', RDF)
+        self.g.bind('dcat', DCAT)
+        self.g.bind('dct', DCT)
+        self.g.bind('vcard', VCARD)
+        self.g.bind('foaf', FOAF)
+        self.g.bind('hydra', HYDRA)
 
         self.persons = {}
 
@@ -76,6 +76,9 @@ class Mapping():
 
         self.g.add((hydra_collection, RDF.type, HYDRA.collection))
 
+        for person in self.persons.values():
+            self.g.add((catalog, DCT.creator, person))
+
     def map_entry(self, entry: EntryMetadata, slim=False):
         dataset = URIRef(url('datasets', entry.calc_id))
 
diff --git a/nomad/config.py b/nomad/config.py
index 2e11792eda59a34b19e1a79367baaf2205d6897b..fb56c7ddc5d5a89a8ea240efcd045c62c56961bf 100644
--- a/nomad/config.py
+++ b/nomad/config.py
@@ -177,8 +177,7 @@ tests = NomadConfig(
 def api_url(ssl: bool = True, api: str = 'api'):
     protocol = 'https' if services.https and ssl else 'http'
     host_and_port = services.api_host.strip('/')
-    standard_port = 443 if protocol == 'https' else 80
-    if services.api_port != standard_port:
+    if services.api_port not in [80, 443]:
         host_and_port += ':' + str(services.api_port)
     base_path = services.api_base_path.strip('/')
     return f'{protocol}://{host_and_port}/{base_path}/{api}'