diff --git a/openVulkanoCpp/IO/Archive/ArchiveWriter.cpp b/openVulkanoCpp/IO/Archive/ArchiveWriter.cpp
index 9d0493d..7f083b8 100644
--- a/openVulkanoCpp/IO/Archive/ArchiveWriter.cpp
+++ b/openVulkanoCpp/IO/Archive/ArchiveWriter.cpp
@@ -78,7 +78,7 @@ namespace OpenVulkano
 		ChkErr(result);
 		LibArchiveHelper::CheckError(result, archiveDisk.get(), m_logger);
 		ChkErr(archive_write_finish_entry(m_archive));
-		m_bytesWritten += archive_entry_size(m_archiveEntry);
+		m_bytesWritten += static_cast<size_t>(archive_entry_size(m_archiveEntry));
 		return true;
 	}