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-rw-r--r--lib/spack/spack/config.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/config.py b/lib/spack/spack/config.py
index 06954f535b..3bdefd3a6c 100644
--- a/lib/spack/spack/config.py
+++ b/lib/spack/spack/config.py
@@ -548,7 +548,7 @@ def update_config(section, update_data, scope=None):
if isinstance(update_data, list):
configuration = update_data
else:
- configuration.extend(update_data)
+ configuration.update(update_data)
# read only the requested section's data.
scope.sections[section] = {section: configuration}