diff --git a/copy.asm b/copy.asm
index 540752e..f134212 100644
--- a/copy.asm
+++ b/copy.asm
@@ -11,9 +11,12 @@ main:
     mov si, [si]
     push ds
     push es
-    pop ds
+    mov ax, cs
+    mov ds, ax
+    mov es, ax
     cld
     rep movsw
+    pop es
     pop ds
 
     retf 6