diff --git a/src/DateHandler/_Date_nb.py b/src/DateHandler/_Date_nb.py
index 2ccf9dce4..fb7fb2e26 100644
--- a/src/DateHandler/_Date_nb.py
+++ b/src/DateHandler/_Date_nb.py
@@ -176,4 +176,4 @@ class DateDisplayNb(DateDisplay):
 # Register classes
 #
 #-------------------------------------------------------------------------
-register_datehandler(('nb_NO', 'nb', 'norsk', 'Norwegian'), DateParserNb, DateDisplayNb)
+register_datehandler(('nb_NO', 'nb', 'nn_NO', 'nn', 'norsk', 'Norwegian'), DateParserNb, DateDisplayNb)