diff --git a/test-data/unit/check-parameter-specification.test b/test-data/unit/check-parameter-specification.test
index 261a3723e8781..58a3c85837c30 100644
--- a/test-data/unit/check-parameter-specification.test
+++ b/test-data/unit/check-parameter-specification.test
@@ -1298,6 +1298,7 @@ reveal_type(bar(C(fn=foo, x=1)))  # N: Revealed type is "__main__.C[[x: builtins
 [builtins fixtures/paramspec.pyi]
 
 [case testParamSpecClassConstructor]
+# flags: --strict-optional
 from typing import ParamSpec, Callable
 
 P = ParamSpec("P")