diff --git a/7.3.721 b/7.3.721
new file mode 100644
index 0000000..d9a139f
--- /dev/null
+++ b/7.3.721
@@ -0,0 +1,60 @@
+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.721
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.721
+Problem:    Ruby interface defines local functions globally.
+Solution:   Make the functions static.
+Files:	    src/if_ruby.c
+
+
+*** ../vim-7.3.720/src/if_ruby.c	2012-10-03 18:06:55.000000000 +0200
+--- src/if_ruby.c	2012-11-20 15:35:46.000000000 +0100
+***************
+*** 336,346 ****
+  #endif
+  
+  #ifdef RUBY19_OR_LATER
+! SIGNED_VALUE rb_num2long_stub(VALUE x)
+  {
+      return dll_rb_num2long(x);
+  }
+! VALUE rb_int2big_stub(SIGNED_VALUE x)
+  {
+      return dll_rb_int2big(x);
+  }
+--- 336,346 ----
+  #endif
+  
+  #ifdef RUBY19_OR_LATER
+! static SIGNED_VALUE rb_num2long_stub(VALUE x)
+  {
+      return dll_rb_num2long(x);
+  }
+! static VALUE rb_int2big_stub(SIGNED_VALUE x)
+  {
+      return dll_rb_int2big(x);
+  }
+*** ../vim-7.3.720/src/version.c	2012-11-20 16:56:49.000000000 +0100
+--- src/version.c	2012-11-20 16:58:32.000000000 +0100
+***************
+*** 727,728 ****
+--- 727,730 ----
+  {   /* Add new patch number below this line */
++ /**/
++     721,
+  /**/
+
+-- 
+hundred-and-one symptoms of being an internet addict:
+39. You move into a new house and decide to Netscape before you landscape.
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
+///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\  an exciting new programming language -- http://www.Zimbu.org        ///
+ \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///