diff --git a/bitmap_xor.go b/bitmap_xor.go
index c868ec3..1d911a9 100644
--- a/bitmap_xor.go
+++ b/bitmap_xor.go
@@ -5,6 +5,6 @@ package dht
 func xor(dst, a, b []byte) {
 	n := len(a)
 	for i := 0; i < n; i++ {
-		distance.data[i] = bitmap.data[i] ^ other.data[i]
+		dst[i] = a[i] ^ b[i]
 	}
 }
diff --git a/sample/spider/spider b/sample/spider/spider
index 9181c7b..d7be7ea 100755
Binary files a/sample/spider/spider and b/sample/spider/spider differ