diff --git a/pytato/loopy.py b/pytato/loopy.py
index 5b49adeccca2b10aee91a370700416ef0ba4af45..11ac1bbe9ed55f82f0b26e72631ae5f420c52891 100644
--- a/pytato/loopy.py
+++ b/pytato/loopy.py
@@ -207,8 +207,8 @@ def call_loopy(translation_unit: "lp.TranslationUnit",
 
     # {{{ sanity checks
 
-    if any([arg.is_input and arg.is_output
-            for arg in translation_unit[entrypoint].args]):
+    if any(arg.is_input and arg.is_output
+            for arg in translation_unit[entrypoint].args):
         # Pytato DAG cannot have stateful nodes.
         raise ValueError("Cannot call a kernel with side-effects.")