diff --git a/mwclient/listing.py b/mwclient/listing.py
index 1873bde5ef0be93fc97c9bcc13bdaed60a43ae41..0283ceffe9162ac66605b42ccc2f46ff37fecb0a 100644
--- a/mwclient/listing.py
+++ b/mwclient/listing.py
@@ -275,10 +275,6 @@ class PageList(GeneratorList):
             namespace = f'{self.site.namespaces[ns].replace(" ", "_")}:'
             if name.startswith(namespace):
                 return ns
-            elif ns in self.site.default_namespaces:
-                namespace = f'{self.site.default_namespaces[ns].replace(" ", "_")}:'
-                if name.startswith(namespace):
-                    return ns
         return 0