diff --git a/ponydos.asm b/ponydos.asm
index a3bef61..788b7b8 100644
--- a/ponydos.asm
+++ b/ponydos.asm
@@ -21,7 +21,7 @@ start:
 	mov ds, ax
 	mov es, ax
 	mov ss, ax
-	mov sp, $$
+	xor sp, sp
 
 	; Clear BSS
 	;xor al, al