diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 21c79949cad24655722816a2ea1c4c8dfb47d999..7701e0a7a28861cf83c5b7bbf2e57aa047c9e097 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,18 @@
+*   Change number_to_currency behavior for checking negativity.
+
+    Used `to_f.negative` instead of using `to_f.phase` for checking negativity
+    of a number in number_to_currency helper.
+    This change works same for all cases except when number is "-0.0".
+
+        -0.0.to_f.negative? => false
+        -0.0.to_f.phase? => 3.14
+
+    This change reverts changes from https://github.com/rails/rails/pull/6512.
+    But it should be acceptable as we could not find any currency which
+    supports negative zeros.
+
+    *Prathamesh Sonpatki*, *Rafael Mendonça França*
+
 *   Match `HashWithIndifferentAccess#default`'s behaviour with `Hash#default`.
 
     *David Cornu*
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 7986eb50f00dcafd0a2cf09cd27d6b97cd7410d2..fe8e871fed294bd4b31fc2387ad02cad06029790 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
@@ -7,7 +7,7 @@ def convert
         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 +18,6 @@ def convert
 
       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
diff --git a/activesupport/test/number_helper_test.rb b/activesupport/test/number_helper_test.rb
index b3464462c8637f96f22b7f9aa5e56003bda34a27..6696111476d39332b0919a2339925271aea66c81 100644
--- a/activesupport/test/number_helper_test.rb
+++ b/activesupport/test/number_helper_test.rb
@@ -74,7 +74,6 @@ def test_number_to_currency
           assert_equal("1,234,567,890.50 Kč", number_helper.number_to_currency("1234567890.50", {:unit => "Kč", :format => "%n %u"}))
           assert_equal("1,234,567,890.50 - Kč", number_helper.number_to_currency("-1234567890.50", {:unit => "Kč", :format => "%n %u", :negative_format => "%n - %u"}))
           assert_equal("0.00", number_helper.number_to_currency(+0.0, {:unit => "", :negative_format => "(%n)"}))
-          assert_equal("(0.00)", number_helper.number_to_currency(-0.0, {:unit => "", :negative_format => "(%n)"}))
         end
       end