diff --git a/lib/rubocop/cop/util.rb b/lib/rubocop/cop/util.rb
index <HASH>..<HASH> 100644
--- a/lib/rubocop/cop/util.rb
+++ b/lib/rubocop/cop/util.rb
@@ -24,7 +24,7 @@ module RuboCop
 
       # Match literal regex characters, not including anchors, character
       # classes, alternatives, groups, repetitions, references, etc
-      LITERAL_REGEX = /[\w\s\-,"'!#%&<>=;:`~]|\\[^AbBdDgGhHkpPRwWXsSzZS0-9]/
+      LITERAL_REGEX = /[\w\s\-,"'!#%&<>=;:`~]|\\[^AbBdDgGhHkpPRwWXsSzZ0-9]/
 
       module_function
:warning: character class has duplicated range

There're two "S"s in the literal