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-rw-r--r--src/buildstream/_gitsourcebase.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/buildstream/_gitsourcebase.py b/src/buildstream/_gitsourcebase.py
index 1f74bb972..e3b246677 100644
--- a/src/buildstream/_gitsourcebase.py
+++ b/src/buildstream/_gitsourcebase.py
@@ -70,14 +70,14 @@ def _strip_tag(rev):
# tags (list): Tag configuration; see _GitSourceBase._load_tags
#
class _GitMirror(SourceFetcher):
- def __init__(self, source, path, url, ref, *, primary=False, tags=[]):
+ def __init__(self, source, path, url, ref, *, primary=False, tags=None):
super().__init__()
self.source = source
self.path = path
self.url = url
self.ref = ref
- self.tags = tags
+ self.tags = tags or []
self.primary = primary
self.mirror = os.path.join(source.get_mirror_directory(), utils.url_directory_name(url))