diff --git a/zip_file.hpp b/zip_file.hpp
index c324f70..0943fb9 100644
--- a/zip_file.hpp
+++ b/zip_file.hpp
@@ -5103,7 +5103,7 @@ tm safe_localtime(const time_t &t)
 #endif
 }
 
-std::size_t write_callback(void *opaque, std::uint64_t file_ofs, const void *pBuf, std::size_t n)
+std::size_t write_callback(void *opaque, mz_uint64 file_ofs, const void *pBuf, std::size_t n)
 {
     auto buffer = static_cast<std::vector<char> *>(opaque);