diff --git a/distgit_bugzilla_sync/script.py b/distgit_bugzilla_sync/script.py
index f75b0d2..7678515 100644
--- a/distgit_bugzilla_sync/script.py
+++ b/distgit_bugzilla_sync/script.py
@@ -228,7 +228,7 @@ class BugzillaProxy:
         that the bugzilla_email is the key and the username the value.
         """
         for username in self.user_cache:
-            bz_email = self.user_cache[username]["bugzilla_email"].lower()
+            bz_email = self.user_cache[username]["email"].lower()
             self.inverted_user_cache[bz_email] = username
 
     def _get_bugzilla_email(self, username):