diff --git a/ChangeLog b/ChangeLog
index a77ab60fbc..c8de1e1c4b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Wed May 30 16:20:00 2012  Kenta Murata  <mrkn@cookpad.com>
+
+	* ext/bigdecimal/lib/bigdecimal/jacobian.rb (Jacobian#dfdxi):
+	  fix jacobian to get stuck in an infinite loop when a solution is not
+	  found due to forget to increment nRetry counter.
+	  Patch by alperakgun from github.com/shyouhei/ruby/pull/8
+
 Wed May 30 10:58:31 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* time.c (utc_offset_arg): utc offset can be precision in seconds.
diff --git a/ext/bigdecimal/lib/bigdecimal/jacobian.rb b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
index 8ab836259a..f53e5b1437 100644
--- a/ext/bigdecimal/lib/bigdecimal/jacobian.rb
+++ b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
@@ -53,7 +53,8 @@ module Jacobian
     until ok>0 do
       s = f.zero
       deriv = []
-      if(nRetry>100) then
+      nRetry += 1
+      if nRetry > 100
         raise "Singular Jacobian matrix. No change at x[" + i.to_s + "]"
       end
       dx = dx*f.two