diff --git a/arch/i386/boot/edd.c b/arch/i386/boot/edd.c
index 25a2824..7e97d86 100644
--- a/arch/i386/boot/edd.c
+++ b/arch/i386/boot/edd.c
@@ -72,7 +72,6 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei)
 	u32 mbrsig;
 	u32 buf_base, mbr_base;
 	extern char _end[];
-	static char mbr_buf[1024];
 
 	sector_size = ei->params.bytes_per_sector;
 	if (!sector_size)
@@ -80,7 +79,7 @@ static u32 read_mbr_sig(u8 devno, struct edd_info *ei)
 
 	buf_base = (ds() << 4) + (u32)&_end;
 	mbr_base = (buf_base+sector_size-1) & ~(sector_size-1);
-	mbrbuf_ptr = mbr_buf + (mbr_base-buf_base);
+	mbrbuf_ptr = _end + (mbr_base-buf_base);
 	mbrbuf_end = mbrbuf_ptr + sector_size;
 
 	if (!(boot_params.hdr.loadflags & CAN_USE_HEAP))