diff --git a/.swiftlint.yml b/.swiftlint.yml
index 872b2998..9f232531 100644
--- a/.swiftlint.yml
+++ b/.swiftlint.yml
@@ -53,6 +53,7 @@ opt_in_rules:
   - nslocalizedstring_require_bundle
   - number_separator
   - object_literal
+  - one_declaration_per_file
   - operator_usage_whitespace
   - optional_enum_case_matching
   - overridden_super_call