diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..9c9d2993c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+# Patches must have Unix-style line endings, even on Windows
+tasks/vendoring/patches/* eol=lf
diff --git a/tasks/vendoring/__init__.py b/tasks/vendoring/__init__.py
index 36bbdec68..9e0e4d494 100644
--- a/tasks/vendoring/__init__.py
+++ b/tasks/vendoring/__init__.py
@@ -73,7 +73,7 @@ def rewrite_imports(package_dir, vendored_libs):
 
 def rewrite_file_imports(item, vendored_libs):
     """Rewrite 'import xxx' and 'from xxx import' for vendored_libs"""
-    text = item.read_text()
+    text = item.read_text(encoding='utf-8')
     # Revendor pkg_resources.extern first
     text = re.sub(r'pkg_resources.extern', r'pip._vendor', text)
     for lib in vendored_libs:
@@ -87,7 +87,7 @@ def rewrite_file_imports(item, vendored_libs):
             r'\1from pip._vendor.%s' % lib,
             text,
         )
-    item.write_text(text)
+    item.write_text(text, encoding='utf-8')
 
 
 def apply_patch(ctx, patch_file_path):