diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index 5470555d8e..3d010e7008 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Customize default BigDecimal formatting. References #5672 [dave@pragprog.com]
+
 * Correctly convert <foo nil="true"> to nil when using Hash.create_from_xml.  [Rick]
 
 * Optional identity for Enumerable#sum defaults to zero. #5657 [gensym@mac.com]
diff --git a/activesupport/lib/active_support/core_ext/bigdecimal.rb b/activesupport/lib/active_support/core_ext/bigdecimal.rb
new file mode 100644
index 0000000000..436b3e000f
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/bigdecimal.rb
@@ -0,0 +1,3 @@
+require 'bigdecimal'
+
+require File.dirname(__FILE__) + '/bigdecimal/formatting.rb'
diff --git a/activesupport/lib/active_support/core_ext/bigdecimal/formatting.rb b/activesupport/lib/active_support/core_ext/bigdecimal/formatting.rb
new file mode 100644
index 0000000000..d86adbea6c
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/bigdecimal/formatting.rb
@@ -0,0 +1,7 @@
+class BigDecimal #:nodoc:
+  
+  alias :_original_to_s :to_s
+  def to_s(format="F")
+    _original_to_s(format)
+  end
+end
\ No newline at end of file