diff --git a/vyper/builtins/_signatures.py b/vyper/builtins/_signatures.py
index 6562ac9ac6..df6fa68425 100644
--- a/vyper/builtins/_signatures.py
+++ b/vyper/builtins/_signatures.py
@@ -108,7 +108,9 @@ def _validate_arg_types(self, node):
 
         for kwarg in node.keywords:
             kwarg_settings = self._kwargs[kwarg.arg]
-            if kwarg_settings.require_literal and not check_variable_constancy(kwarg.value, VariableConstancy.RUNTIME_CONSTANT):
+            if kwarg_settings.require_literal and not check_variable_constancy(
+                kwarg.value, VariableConstancy.RUNTIME_CONSTANT
+            ):
                 raise TypeMismatch("Value must be literal or environment variable", kwarg.value)
             self._validate_single(kwarg.value, kwarg_settings.typ)
 
diff --git a/vyper/semantics/types/function.py b/vyper/semantics/types/function.py
index b2ed83b70c..39b60faf3c 100644
--- a/vyper/semantics/types/function.py
+++ b/vyper/semantics/types/function.py
@@ -16,7 +16,12 @@
     StateAccessViolation,
     StructureException,
 )
-from vyper.semantics.analysis.base import FunctionVisibility, StateMutability, StorageSlot, VariableConstancy
+from vyper.semantics.analysis.base import (
+    FunctionVisibility,
+    StateMutability,
+    StorageSlot,
+    VariableConstancy,
+)
 from vyper.semantics.analysis.utils import check_variable_constancy, validate_expected_type
 from vyper.semantics.data_locations import DataLocation
 from vyper.semantics.types.base import KwargSettings, VyperType