diff --git a/django/conf/locale/pl/formats.py b/django/conf/locale/pl/formats.py
index 582092d620e..1c538b26ab6 100644
--- a/django/conf/locale/pl/formats.py
+++ b/django/conf/locale/pl/formats.py
@@ -33,5 +33,5 @@ DATETIME_INPUT_FORMATS = (
     '%Y-%m-%d',             # '2006-10-25'
 )
 DECIMAL_SEPARATOR = ','
-THOUSAND_SEPARATOR = ' '
+THOUSAND_SEPARATOR = u' '
 NUMBER_GROUPING = 3