diff --git a/tests/commands/test_lib.py b/tests/commands/test_lib.py
index 8513d401..a4c31bce 100644
--- a/tests/commands/test_lib.py
+++ b/tests/commands/test_lib.py
@@ -253,7 +253,7 @@ def test_lib_show(clirunner, validate_cliresult):
     validate_cliresult(result)
     assert all(
         [s in result.output for s in ("ArduinoJson", "Arduino", "Atmel AVR")])
-    result = clirunner.invoke(cmd_lib, ["show", "OneWire"])
+    result = clirunner.invoke(cmd_lib, ["show", "OneWire", "--json-output"])
     validate_cliresult(result)
     assert "OneWire" in result.output