diff --git a/source/kernel/bank4/partit.mac b/source/kernel/bank4/partit.mac
index 94c0c441..633d4016 100644
--- a/source/kernel/bank4/partit.mac
+++ b/source/kernel/bank4/partit.mac
@@ -4169,7 +4169,7 @@ IDRVR_RET:
 
 DOSV1_2:
 	xor	a
-	ld	b,a
+	ld	bc,_DOSVER##  ;Make B=0 and preserve C, some programs actually check it
 	ret