diff --git a/.flake8 b/.flake8
new file mode 100644
index 000000000..4f16d6847
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,4 @@
+[flake8]
+
+# Match the maximum line length in Swift files.
+max-line-length = 120
diff --git a/build-script-helper.py b/build-script-helper.py
index abde94bb2..6842ae4e8 100755
--- a/build-script-helper.py
+++ b/build-script-helper.py
@@ -15,12 +15,12 @@
 from __future__ import print_function
 
 import argparse
-import sys
-import os, platform
+import json
+import os
 import subprocess
+import sys
 from pathlib import Path
-from typing import List, Union, Optional
-import json
+from typing import List, Optional, Union
 
 # -----------------------------------------------------------------------------
 # General utilities