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-rw-r--r--rdiff-backup/rdiff_backup/user_group.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/rdiff-backup/rdiff_backup/user_group.py b/rdiff-backup/rdiff_backup/user_group.py
index 2baeda2..896e60e 100644
--- a/rdiff-backup/rdiff_backup/user_group.py
+++ b/rdiff-backup/rdiff_backup/user_group.py
@@ -141,7 +141,7 @@ def init_user_mapping(mapping_string = None):
if mapping_string: UserMap = DefinedMap(name2id_func, mapping_string)
else: UserMap = Map(name2id_func)
-def init_group_mapping(mapping_string):
+def init_group_mapping(mapping_string = None):
"""Initialize the group mapping dictionary with given mapping string"""
global GroupMap
name2id_func = lambda name: grp.getgrnam(name)[2]