diff --git a/patch_bp.py b/patch_bp.py
index 9ad38e2..deddf64 100644
--- a/patch_bp.py
+++ b/patch_bp.py
@@ -121,7 +121,7 @@ class BPScript:
         new_len = new_offsets[last_key] + last_len
         # 对齐到16字节
         new_len = new_len + (16 - new_len % 16)
-        data = bytearray(data[:all_keys[0]] + b'\0' * (new_len - old_len) + data[all_keys[0] + last_len:])
+        data = bytearray(data + b'\0' * (new_len - self.len))
         self.len = new_len
         data[4:8] = struct.pack('<L', self.len - self.header_size)
         for i in all_keys: