diff --git a/mimesis/builtins/ru.py b/mimesis/builtins/ru.py
index <HASH>..<HASH> 100755
--- a/mimesis/builtins/ru.py
+++ b/mimesis/builtins/ru.py
@@ -82,7 +82,7 @@ class RussiaSpecProvider(BaseSpecProvider):
         :Example:
             57 16 805199.
         """
-        return '{}{}'.format(
+        return '{} {}'.format(
             self.passport_series(),
             self.passport_number(),
         )
Update format for series_and_number (#<I>)

Need a space between series and number