1 files changed, 3 insertions, 5 deletions
diff --git a/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb b/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb
index 7986eb50f0..57f40f33bf 100644
--- a/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_currency_converter.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/numeric/inquiry'
+
 module ActiveSupport
   module NumberHelper
     class NumberToCurrencyConverter < NumberConverter # :nodoc:
@@ -7,7 +9,7 @@ module ActiveSupport
         number = self.number.to_s.strip
         format = options[:format]
 
-        if is_negative?(number)
+        if number.to_f.negative?
           format = options[:negative_format]
           number = absolute_value(number)
         end
@@ -18,10 +20,6 @@ module ActiveSupport
 
       private
 
-        def is_negative?(number)
-          number.to_f.phase != 0
-        end
-
         def absolute_value(number)
           number.respond_to?(:abs) ? number.abs : number.sub(/\A-/, '')
         end