diff --git a/ChangeLog b/ChangeLog
index c2439e6833..a8110e4d67 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Sep 20 04:42:18 2014  Masaki Matsushita <glass.saga@gmail.com>
+
+	* lib/csv.rb: avoid unnecessary object allocations.
+	  patch is from Andrew Vit. [ruby-core:63215] [Feature #9952]
+
 Sun Sep 21 12:10:18 2014  SHIBATA Hiroshi  <shibata.hiroshi@gmail.com>
 
 	* lib/rexml/**/*.rb: removed commented-out code.
diff --git a/lib/csv.rb b/lib/csv.rb
index 60b22e76ba..c56f11bcf4 100644
--- a/lib/csv.rb
+++ b/lib/csv.rb
@@ -238,10 +238,10 @@ class CSV
       headers.each { |h| h.freeze if h.is_a? String }
 
       # handle extra headers or fields
-      @row = if headers.size > fields.size
+      @row = if headers.size >= fields.size
         headers.zip(fields)
       else
-        fields.zip(headers).map { |pair| pair.reverse }
+        fields.zip(headers).map { |pair| pair.reverse! }
       end
     end