diff --git a/dev-tools/gerrit-send-mail.py b/dev-tools/gerrit-send-mail.py
index 5429aef6d9f..67a2cf1b1eb 100755
--- a/dev-tools/gerrit-send-mail.py
+++ b/dev-tools/gerrit-send-mail.py
@@ -109,7 +109,7 @@ def apply_patch_mods(patch_text, details, args):
     )
     filename = f"gerrit-{args.changeid}-{details['revision']}.patch"
     patch_text_final = patch_text_mod.replace("Subject: [PATCH]", f"Subject: [PATCH v{details['revision']}]")
-    with open(filename, "w") as patch_file:
+    with open(filename, "w", encoding="utf-8", newline="\n") as patch_file:
         patch_file.write(patch_text_final)
     print("send with:")
     print(f"git send-email --in-reply-to {details['msg_id']} {filename}")