diff --git a/feedgen/entry.py b/feedgen/entry.py
index f7a13a8..5dd21c2 100644
--- a/feedgen/entry.py
+++ b/feedgen/entry.py
@@ -499,7 +499,7 @@ def description(self, description=None, isSummary=False):
         if description is not None:
             self.__rss_description = description
             if isSummary:
-                self.__atom_summary = description
+                self.__atom_summary = {'summary': description}
             else:
                 self.__atom_content = {'content': description}
         return self.__rss_description