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-rw-r--r--src/buildstream/source.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/buildstream/source.py b/src/buildstream/source.py
index 2cfc23c58..43957378d 100644
--- a/src/buildstream/source.py
+++ b/src/buildstream/source.py
@@ -1282,7 +1282,7 @@ class Source(Plugin):
@classmethod
def __extract_config(cls, meta):
config = cls.__defaults.get_mapping('config', default={})
- config = config.copy()
+ config = config.clone()
meta.config._composite(config)
config._assert_fully_composited()