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-rwxr-xr-xtools/testing/kunit/kunit.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index 5b222418eacd..e4250c4b06fb 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -105,7 +105,7 @@ def main(argv, linux=None):
run_parser.add_argument('--build_dir',
help='As in the make command, it specifies the build '
'directory.',
- type=str, default=None, metavar='build_dir')
+ type=str, default='', metavar='build_dir')
run_parser.add_argument('--defconfig',
help='Uses a default kunitconfig.',