diff --git a/avrdude-5.5.usbtiny.64bit.patch b/avrdude-5.5.usbtiny.64bit.patch
new file mode 100644
index 0000000..48bdcd6
--- /dev/null
+++ b/avrdude-5.5.usbtiny.64bit.patch
@@ -0,0 +1,35 @@
+--- avrdude-5.5/usbtiny.c	2007-10-29 09:40:04.000000000 -0600
++++ avrdude-5.5.patched/usbtiny.c	2008-01-06 07:13:41.000000000 -0700
+@@ -138,7 +138,7 @@
+     fprintf( stderr, "Operation %d not defined for this chip!\n", op );
+     return -1;
+   }
+-  memset(cmd, 0, sizeof(cmd));
++  memset(cmd, 0, 4);
+   avr_set_bits(p->op[op], cmd);
+ 
+   return pgm->cmd(pgm, cmd, res);
+@@ -286,19 +286,19 @@
+   int nbytes;
+ 
+   // Make sure its empty so we don't read previous calls if it fails
+-  memset(res, '\0', sizeof(res) );
++  memset(res, '\0', 4 );
+ 
+   nbytes = usb_in( USBTINY_SPI,
+ 		   (cmd[1] << 8) | cmd[0],  // convert to 16-bit words
+ 		   (cmd[3] << 8) | cmd[2],  //  "
+-			res, sizeof(res), 8 * sck_period );
++			res, 4, 8 * sck_period );
+   if (verbose > 1) {
+     // print out the data we sent and received
+-    printf( "CMD: [%02x %02x %02x %02x] [%02x %02x %02x %02x]\n",
++    printf( "CMD: [%02x %02x %02x %02x] [%02x %02x %02x %02x] \n",
+ 	    cmd[0], cmd[1], cmd[2], cmd[3],
+ 	    res[0], res[1], res[2], res[3] );
+   }
+-  return ((nbytes == sizeof(res)) &&      // should have read 4 bytes
++  return ((nbytes == 4) &&      // should have read 4 bytes
+ 	  res[2] == cmd[1]);              // AVR's do a delayed-echo thing
+ }
+ 
diff --git a/avrdude.spec b/avrdude.spec
index 844a69c..7427036 100644
--- a/avrdude.spec
+++ b/avrdude.spec
@@ -1,12 +1,13 @@
 Name:           avrdude
 Version:        5.5
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Software for programming Atmel AVR Microcontroller
 
 Group:          Applications/Engineering
 License:        GPLv2+
-URL:            http://www.bsdhome.com/avrdude/
+URL:            http://www.nongnu.org/avrdude
 Source0:        http://download.savannah.gnu.org/releases/%{name}/%{name}-%{version}.tar.gz
+Patch0: 	avrdude-5.5.usbtiny.64bit.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  flex
@@ -32,6 +33,7 @@ particular chip.
 
 %prep
 %setup -q
+%patch0 -p1
 chmod -x safemode.c doc/TODO
 sed -i 's|/usr/local/etc/avrdude.conf|/etc/avrdude/avrdude.conf|g' doc/avrdude.texi avrdude.1
 sed -i 's|/etc/avrdude.conf|/etc/avrdude/avrdude.conf|g' doc/avrdude.texi avrdude.1
@@ -79,6 +81,10 @@ fi
 
 
 %changelog
+* Fri Jan 11 2008 Trond Danielsen <trond.danielsen@gmail.com> - 5.5-2
+- Added patch for 64-bit systems.
+- Corrected the URL to the avrude homepage.
+
 * Sat Dec 29 2007 Trond Danielsen <trond.danielsen@gmail.com> - 5.5-1
 - New upstream version
 - Fixed minor rpmlint warning.