1 files changed, 2 insertions, 2 deletions
diff --git a/svp.cpu b/svp.cpu
index 07e04f6..d6c7fb7 100644
--- a/svp.cpu
+++ b/svp.cpu
@@ -36,9 +36,9 @@ svp_pop
 	
 svp_push
 	arg src 16
-	add -1 stackidx stackidx
+	sub 1 stackidx stackidx
 	switch stackidx
-	case -1
+	case 0xFF
 	mov 5 stackidx
 	end
 	mov src stack.stackidx