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-rw-r--r--compose/config/config.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/compose/config/config.py b/compose/config/config.py
index adfb53d8..4c3f93dd 100644
--- a/compose/config/config.py
+++ b/compose/config/config.py
@@ -1023,6 +1023,7 @@ def merge_build(output, base, override):
md.merge_mapping('args', parse_build_arguments)
md.merge_field('cache_from', merge_unique_items_lists, default=[])
md.merge_mapping('labels', parse_labels)
+ md.merge_mapping('extra_hosts', parse_extra_hosts)
return dict(md)