--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -206,6 +206,7 @@ static void m25p_addr2cmd(struct m25p *f
 	cmd[1] = addr >> (flash->addr_width * 8 -  8);
 	cmd[2] = addr >> (flash->addr_width * 8 - 16);
 	cmd[3] = addr >> (flash->addr_width * 8 - 24);
+	cmd[4] = 0;
 }
 
 static int m25p_cmdsz(struct m25p *flash)
