diff --git a/plat/msdos86/libsys/unlink.s b/plat/msdos86/libsys/unlink.s
new file mode 100644
index 000000000..912f6958d
--- /dev/null
+++ b/plat/msdos86/libsys/unlink.s
@@ -0,0 +1,23 @@
+#
+! $Source$
+! $State$
+! $Revision$
+
+! Declare segments (the order is important).
+
+.sect .text
+.sect .rom
+.sect .data
+.sect .bss
+
+.sect .text
+
+! Remove a file.
+
+.define _unlink
+_unlink:
+	mov bx, sp
+	mov dx, 2(bx)
+	movb ah, 0x41
+	int 0x21
+	jmp .sys_zret