diff --git a/.swiftformat b/.swiftformat
index b591701..58c6e4a 100644
--- a/.swiftformat
+++ b/.swiftformat
@@ -1,5 +1,6 @@
 --callsiteparen balanced
 --commas inline
+--decimal-grouping none
 --header "//\n// This Source Code Form is subject to the terms of the Mozilla Public License,\n// v. 2.0. If a copy of the MPL was not distributed with this file, You can\n// obtain one at https://mozilla.org/MPL/2.0/.\n//\n// Copyright {created.year} Nicola Clark\n//"
 --indent 2
 --maxwidth 100