1 files changed, 3 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb b/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
index 6405afc9a6..d85cc086d7 100644
--- a/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_delimited_converter.rb
@@ -13,7 +13,9 @@ module ActiveSupport
 
         def parts
           left, right = number.to_s.split('.')
-          left.gsub!(DELIMITED_REGEX) { "#{$1}#{options[:delimiter]}" }
+          left.gsub!(DELIMITED_REGEX) do |digit_to_delimit|
+            "#{digit_to_delimit}#{options[:delimiter]}"
+          end
           [left, right].compact
         end
     end