diff --git a/hapsigntool_cpp/utils/src/file_utils.cpp b/hapsigntool_cpp/utils/src/file_utils.cpp
index 0e1d3a44d9c084583fec64d4e058384cad2b7879..6940f95760171aeb375ac0e0f9409f2d0f22f82e 100644
--- a/hapsigntool_cpp/utils/src/file_utils.cpp
+++ b/hapsigntool_cpp/utils/src/file_utils.cpp
@@ -275,7 +275,7 @@ int FileUtils::WriteInputToOutPut(std::ifstream& input, std::ofstream& output, s
             return IO_ERROR;
         }
         length -= input.gcount();
-        output.write(buf, min);
+        output.write(buf, input.gcount());
         if (!output.good()) {
             SIGNATURE_TOOLS_LOGE("write error!");
             delete[] buf;