diff --git a/ChangeLog b/ChangeLog
index d1485af22..0d8176af5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-06-07  Pavel Roskin  <proski@gnu.org>
+
+	* util/biosdisk.c (open_device): Revert last change to the
+	function, it broke installation.  The sector needs to be
+	different dependent on which device is opened.
+
 2008-06-06  Robert Millan  <rmh@aybabtu.com>
 
 	Ensure GRUB_KERNEL_MACHINE_DATA_END is always consistent with the
diff --git a/util/biosdisk.c b/util/biosdisk.c
index eb1f3ff9b..90df4f1ef 100644
--- a/util/biosdisk.c
+++ b/util/biosdisk.c
@@ -298,6 +298,9 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
 
     /* Make the buffer cache consistent with the physical disk.  */
     ioctl (fd, BLKFLSBUF, 0);
+
+    if (is_partition)
+      sector -= disk->partition->start;
   }
 #else /* ! __linux__ */
   fd = open (map[disk->id].device, flags);