diff --git a/pelican/generators.py b/pelican/generators.py
index 3b5ca9e4..68f759f4 100644
--- a/pelican/generators.py
+++ b/pelican/generators.py
@@ -382,10 +382,10 @@ class ArticlesGenerator(CachingGenerator):
                     arts,
                     self.context,
                     str(self.settings["CATEGORY_FEED_ATOM"]).format(slug=cat.slug),
-                    self.settings.get(
+                    str(self.settings.get(
                         "CATEGORY_FEED_ATOM_URL",
-                        str(self.settings["CATEGORY_FEED_ATOM"]).format(slug=cat.slug),
-                    ),
+                        self.settings["CATEGORY_FEED_ATOM"])
+                    ).format(slug=cat.slug),
                     feed_title=cat.name,
                 )
 
@@ -394,10 +394,10 @@ class ArticlesGenerator(CachingGenerator):
                     arts,
                     self.context,
                     str(self.settings["CATEGORY_FEED_RSS"]).format(slug=cat.slug),
-                    self.settings.get(
+                    str(self.settings.get(
                         "CATEGORY_FEED_RSS_URL",
-                        str(self.settings["CATEGORY_FEED_RSS"]).format(slug=cat.slug),
-                    ),
+                        self.settings["CATEGORY_FEED_RSS"])
+                    ).format(slug=cat.slug),
                     feed_title=cat.name,
                     feed_type="rss",
                 )
@@ -408,10 +408,10 @@ class ArticlesGenerator(CachingGenerator):
                     arts,
                     self.context,
                     str(self.settings["AUTHOR_FEED_ATOM"]).format(slug=auth.slug),
-                    self.settings.get(
+                    str(self.settings.get(
                         "AUTHOR_FEED_ATOM_URL",
-                        str(self.settings["AUTHOR_FEED_ATOM"]).format(slug=auth.slug),
-                    ),
+                        self.settings["AUTHOR_FEED_ATOM"])
+                    ).format(slug=auth.slug),
                     feed_title=auth.name,
                 )
 
@@ -420,10 +420,10 @@ class ArticlesGenerator(CachingGenerator):
                     arts,
                     self.context,
                     str(self.settings["AUTHOR_FEED_RSS"]).format(slug=auth.slug),
-                    self.settings.get(
+                    str(self.settings.get(
                         "AUTHOR_FEED_RSS_URL",
-                        str(self.settings["AUTHOR_FEED_RSS"]).format(slug=auth.slug),
-                    ),
+                        self.settings["AUTHOR_FEED_RSS"])
+                    ).format(slug=auth.slug),
                     feed_title=auth.name,
                     feed_type="rss",
                 )
@@ -435,10 +435,10 @@ class ArticlesGenerator(CachingGenerator):
                         arts,
                         self.context,
                         str(self.settings["TAG_FEED_ATOM"]).format(slug=tag.slug),
-                        self.settings.get(
+                        str(self.settings.get(
                             "TAG_FEED_ATOM_URL",
-                            str(self.settings["TAG_FEED_ATOM"]).format(slug=tag.slug),
-                        ),
+                            self.settings["TAG_FEED_ATOM"])
+                        ).format(slug=tag.slug),
                         feed_title=tag.name,
                     )
 
@@ -447,10 +447,10 @@ class ArticlesGenerator(CachingGenerator):
                         arts,
                         self.context,
                         str(self.settings["TAG_FEED_RSS"]).format(slug=tag.slug),
-                        self.settings.get(
+                        str(self.settings.get(
                             "TAG_FEED_RSS_URL",
-                            str(self.settings["TAG_FEED_RSS"]).format(slug=tag.slug),
-                        ),
+                            self.settings["TAG_FEED_RSS"])
+                        ).format(slug=tag.slug),
                         feed_title=tag.name,
                         feed_type="rss",
                     )
@@ -469,21 +469,19 @@ class ArticlesGenerator(CachingGenerator):
                         items,
                         self.context,
                         str(self.settings["TRANSLATION_FEED_ATOM"]).format(lang=lang),
-                        self.settings.get(
+                        str(self.settings.get(
                             "TRANSLATION_FEED_ATOM_URL",
-                            str(self.settings["TRANSLATION_FEED_ATOM"]).format(
-                                lang=lang
-                            ),
-                        ),
+                            self.settings["TRANSLATION_FEED_ATOM"])
+                        ).format(lang=lang),
                     )
                 if self.settings.get("TRANSLATION_FEED_RSS"):
                     writer.write_feed(
                         items,
                         self.context,
                         str(self.settings["TRANSLATION_FEED_RSS"]).format(lang=lang),
-                        self.settings.get(
+                        str(self.settings.get(
                             "TRANSLATION_FEED_RSS_URL",
-                            str(self.settings["TRANSLATION_FEED_RSS"]),
+                            self.settings["TRANSLATION_FEED_RSS"])
                         ).format(lang=lang),
                         feed_type="rss",
                     )