diff --git a/uncompyle6/parsers/parse3.py b/uncompyle6/parsers/parse3.py
index 0dd66724..65d66937 100644
--- a/uncompyle6/parsers/parse3.py
+++ b/uncompyle6/parsers/parse3.py
@@ -706,7 +706,7 @@ class Python3Parser(PythonParser):
         # Note: BUILD_TUPLE_UNPACK_WITH_CALL gets considered by
         # default because it starts with BUILD. So we'll set to ignore it from
         # the start.
-        custom_ops_processed = set(("BUILD_TUPLE_UNPACK_WITH_CALL",))
+        custom_ops_processed = {"BUILD_TUPLE_UNPACK_WITH_CALL"}
 
         # A set of instruction operation names that exist in the token stream.
         # We use this customize the grammar that we create.
diff --git a/uncompyle6/parsers/parse37base.py b/uncompyle6/parsers/parse37base.py
index c10ce8fd..b89560f7 100644
--- a/uncompyle6/parsers/parse37base.py
+++ b/uncompyle6/parsers/parse37base.py
@@ -138,7 +138,7 @@ class Python37BaseParser(PythonParser):
         # Note: BUILD_TUPLE_UNPACK_WITH_CALL gets considered by
         # default because it starts with BUILD. So we'll set to ignore it from
         # the start.
-        custom_ops_processed = set(("BUILD_TUPLE_UNPACK_WITH_CALL",))
+        custom_ops_processed = {"BUILD_TUPLE_UNPACK_WITH_CALL"}
 
         # A set of instruction operation names that exist in the token stream.
         # We use this customize the grammar that we create.