diff --git a/loader/i386/pc/chainloader.c b/loader/i386/pc/chainloader.c
index 825dbb3..ab3b203 100644
--- a/loader/i386/pc/chainloader.c
+++ b/loader/i386/pc/chainloader.c
@@ -101,12 +101,24 @@ grub_chainloader_cmd (const char *filename, grub_chainloader_flags_t flags)
 	  /* In i386-pc, the id is equal to the BIOS drive number.  */
 	  drive = (int) disk->id;
 
-	  if (p)
+	  if ((p) && (p->index < 4))
 	    {
-	      grub_disk_read (disk, p->offset, 446, 64,
-			      (char *) GRUB_MEMORY_MACHINE_PART_TABLE_ADDR);
+              int i;
+
+	      disk->dev->read (disk, 0, 1,
+                               (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR);
+
+              grub_memcpy ((char *) GRUB_MEMORY_MACHINE_PART_TABLE_ADDR,
+                           (char *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 0x1be,
+                           64);
+
 	      part_addr = (void *) (GRUB_MEMORY_MACHINE_PART_TABLE_ADDR
 				    + (p->index << 4));
+
+              for (i = 0; i < 4; i++)
+                *((char *) GRUB_MEMORY_MACHINE_PART_TABLE_ADDR + i * 16) = 0;
+
+              *((char *) part_addr) = 0x80;
 	    }
 	}