diff --git a/test/test_multimode_rx.py b/test/test_multimode_rx.py
index 807d2155..1bc6d4d0 100755
--- a/test/test_multimode_rx.py
+++ b/test/test_multimode_rx.py
@@ -234,8 +234,7 @@ def parse_arguments():
         help="Timeout (seconds) before test ends",
     )
 
-    args, _ = parser.parse_known_args()
-    return args
+    return parser.parse_args()
 
 
 if __name__ == "__main__":
diff --git a/test/test_multimode_tx.py b/test/test_multimode_tx.py
index 9335e795..e6d82a4d 100644
--- a/test/test_multimode_tx.py
+++ b/test/test_multimode_tx.py
@@ -180,8 +180,7 @@ def parse_arguments():
         help="list audio devices by number and exit",
     )
 
-    args, _ = parser.parse_known_args()
-    return args
+    return parser.parse_args()
 
 
 if __name__ == "__main__":