diff --git a/pyproject.toml b/pyproject.toml
index 1d32e7d90..93a433608 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,4 +1,9 @@
 [build-system]
-requires = ["setuptools >= 67.8", "wheel"]
 build-backend = "backend"
-backend-path = ["_custom_build"]
+requires = [
+  "setuptools>=67.8",
+  "wheel",
+]
+backend-path = [
+  "_custom_build",
+]
diff --git a/winbuild/build_prepare.py b/winbuild/build_prepare.py
index e7ccf3385..fcc433942 100644
--- a/winbuild/build_prepare.py
+++ b/winbuild/build_prepare.py
@@ -5,7 +5,6 @@ import re
 import shutil
 import struct
 import subprocess
-import sys
 
 
 def cmd_cd(path):
@@ -490,7 +489,7 @@ def build_env():
         cmd_set("INCLIB", "{lib_dir}"),
         cmd_set("LIB", "{lib_dir}"),
         cmd_append("PATH", "{bin_dir}"),
-        f"call {{vcvarsall}} {{vcvars_arch}}",
+        "call {vcvarsall} {vcvars_arch}",
         cmd_set("DISTUTILS_USE_SDK", "1"),  # use same compiler to build Pillow
         cmd_set("py_vcruntime_redist", "true"),  # always use /MD, never /MT
         ":end",
@@ -536,7 +535,7 @@ def build_dep(name):
 
     banner = f"Building {name} ({dir})"
     lines = [
-        rf'call "{{build_dir}}\build_env.cmd"',
+        r'call "{build_dir}\build_env.cmd"',
         "@echo " + ("=" * 70),
         f"@echo ==== {banner:<60} ====",
         "@echo " + ("=" * 70),