diff --git a/.rubocop.yml b/.rubocop.yml
index 2733bcda..a408fa0d 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,3 +2,5 @@ inherit_from:
   - .rubocop_rubyzip.yml
 AllCops:
   TargetRubyVersion: 1.9
+Style/MutableConstant:
+  Enabled: false # Because some existent code relies on mutable constant