diff --git a/conformance/tests/generics_paramspec_basic.py b/conformance/tests/generics_paramspec_basic.py
index 7d461c2f..e2c62258 100644
--- a/conformance/tests/generics_paramspec_basic.py
+++ b/conformance/tests/generics_paramspec_basic.py
@@ -21,7 +21,7 @@
 
 
 def func1(x: P) -> P:  # E
-    ...
+    raise NotImplementedError
 
 
 def func2(x: Concatenate[int, P]) -> int:  # E