diff --git a/tests/argument_parsing/test_argument_parsing.py b/tests/argument_parsing/test_argument_parsing.py
index 8141ead836..fa66a2e14b 100755
--- a/tests/argument_parsing/test_argument_parsing.py
+++ b/tests/argument_parsing/test_argument_parsing.py
@@ -45,7 +45,7 @@ def is_unknown_option(output):
 
 
 def is_unknown_knob(output):
-    return output.startswith("ERROR: Failed to set knob option")
+    return output.startswith("WARNING: Invalid knob option")
 
 
 def is_cli_usage(output):