diff --git a/kernel/syscall.asm b/kernel/syscall.asm
index c4e9300..8efe0e9 100644
--- a/kernel/syscall.asm
+++ b/kernel/syscall.asm
@@ -91,6 +91,7 @@ int21:	push ds
 	push word [cs:bx]
 	; restore user data and launch ret chain
 	mov bx, [PSPBX]
+	mov ds, [PSPDS]
 	ret
 
 err:	mov ah, 0xFF