diff --git a/libuuu/fastboot.h b/libuuu/fastboot.h
index 2acacee7..950235ed 100644
--- a/libuuu/fastboot.h
+++ b/libuuu/fastboot.h
@@ -288,7 +288,7 @@ class FBCopy : public CmdBase
 private:
 	bool m_bDownload;
 	std::string m_local_file;
-	size_t m_Maxsize_pre_cmd = 0x10000;
+	size_t m_Maxsize_pre_cmd = 0x4000;
 	std::string m_target_file;
 };