diff --git a/pelican/generators.py b/pelican/generators.py
index d7ebb0b0..02bed967 100644
--- a/pelican/generators.py
+++ b/pelican/generators.py
@@ -302,7 +302,9 @@ class ArticlesGenerator(Generator):
 
         # order the categories per name
         self.categories = list(self.categories.items())
-        self.categories.sort(reverse=self.settings['REVERSE_CATEGORY_ORDER'])
+        self.categories.sort(
+                key=lambda item: item[0].name,
+                reverse=self.settings['REVERSE_CATEGORY_ORDER'])
 
         self.authors = list(self.authors.items())
         self.authors.sort()