diff --git a/install.cpp b/install.cpp
index 9123fc2..db8fb97 100644
--- a/install.cpp
+++ b/install.cpp
@@ -589,7 +589,7 @@
   // Verify package.
   ui->Print("Verifying update package...\n");
   auto t0 = std::chrono::system_clock::now();
-  int err = verify_file(const_cast<unsigned char*>(package_data), package_size, loadedKeys,
+  int err = verify_file(package_data, package_size, loadedKeys,
                         std::bind(&RecoveryUI::SetProgress, ui, std::placeholders::_1));
   std::chrono::duration<double> duration = std::chrono::system_clock::now() - t0;
   ui->Print("Update package verification took %.1f s (result %d).\n", duration.count(), err);