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-rw-r--r--lib/spack/spack/modules/common.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/modules/common.py b/lib/spack/spack/modules/common.py
index 5667de65b9..4dda4b183b 100644
--- a/lib/spack/spack/modules/common.py
+++ b/lib/spack/spack/modules/common.py
@@ -178,7 +178,7 @@ def merge_config_rules(configuration, spec):
if spec.satisfies(constraint):
if hasattr(constraint, "override") and constraint.override:
spec_configuration = {}
- update_dictionary_extending_lists(spec_configuration, action)
+ update_dictionary_extending_lists(spec_configuration, copy.deepcopy(action))
# Transform keywords for dependencies or prerequisites into a list of spec