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-rw-r--r--lib/spack/llnl/util/filesystem.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/llnl/util/filesystem.py b/lib/spack/llnl/util/filesystem.py
index 4c4ea1d5b8..753129b78e 100644
--- a/lib/spack/llnl/util/filesystem.py
+++ b/lib/spack/llnl/util/filesystem.py
@@ -141,7 +141,7 @@ def filter_file(regex, repl, *filenames, **kwargs):
file.
"""
string = kwargs.get('string', False)
- backup = kwargs.get('backup', True)
+ backup = kwargs.get('backup', False)
ignore_absent = kwargs.get('ignore_absent', False)
stop_at = kwargs.get('stop_at', None)