diff --git a/ChangeLog b/ChangeLog
index 6846f9017..b9dae7f0b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-04-18  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* grub-core/kern/emu/hostdisk.c (grub_util_biosdisk_write): Fix opening
+	mode.
+
 2012-04-18  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* configure.ac: Bump to beta4.
diff --git a/grub-core/kern/emu/hostdisk.c b/grub-core/kern/emu/hostdisk.c
index ea7eb3d90..531fc026f 100644
--- a/grub-core/kern/emu/hostdisk.c
+++ b/grub-core/kern/emu/hostdisk.c
@@ -1081,7 +1081,7 @@ grub_util_biosdisk_write (grub_disk_t disk, grub_disk_addr_t sector,
     {
       int fd;
       grub_disk_addr_t max = ~0ULL;
-      fd = open_device (disk, sector, O_RDONLY, &max);
+      fd = open_device (disk, sector, O_WRONLY, &max);
       if (fd < 0)
 	return grub_errno;