diff --git a/pytype/pyi/parser.py b/pytype/pyi/parser.py
index 6020e52e9..4b95602d5 100644
--- a/pytype/pyi/parser.py
+++ b/pytype/pyi/parser.py
@@ -985,7 +985,7 @@ def new_function(
     # Extract out abstractmethod and coroutine decorators, there should be at
     # most one remaining decorator.
     def _check_decorator(decorators, decorator_set):
-      exists = any([x in decorators for x in decorator_set])
+      exists = any(x in decorators for x in decorator_set)
       if exists:
         decorators -= decorator_set
       return exists