diff --git a/ChangeLog b/ChangeLog
index 2b102cf48..cf1623f36 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-03-05  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* util/grub-mkimage.c (generate_image): Unify diskboot.img size message.
+
 2012-03-05  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/net/http.c: Add TRANSLATORS comments.
diff --git a/util/grub-mkimage.c b/util/grub-mkimage.c
index ef3421628..b49c0815d 100644
--- a/util/grub-mkimage.c
+++ b/util/grub-mkimage.c
@@ -1288,7 +1288,8 @@ generate_image (const char *dir, const char *prefix,
 	boot_path = grub_util_get_path (dir, "diskboot.img");
 	boot_size = grub_util_get_image_size (boot_path);
 	if (boot_size != GRUB_DISK_SECTOR_SIZE)
-	  grub_util_error ("%s", _("diskboot.img is not one sector size"));
+	  grub_util_error (_("diskboot.img size must be %u bytes"),
+			   GRUB_DISK_SECTOR_SIZE);
 
 	boot_img = grub_util_read_image (boot_path);