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-rwxr-xr-xtools/run_tests/run_interop_tests.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index 78096b216c..0d402d67e5 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -662,7 +662,7 @@ argp.add_argument('--prod_servers',
'cloud_to_prod_auth tests against.'))
argp.add_argument('-s', '--server',
choices=['all'] + sorted(_SERVERS),
- action='append',
+ nargs='+',
help='Run cloud_to_cloud servers in a separate docker ' +
'image. Servers can only be started automatically if ' +
'--use_docker option is enabled.',