diff --git a/resources/wx_gui/gui_macos_installer_flash.py b/resources/wx_gui/gui_macos_installer_flash.py
index f348541dc..30433ce20 100644
--- a/resources/wx_gui/gui_macos_installer_flash.py
+++ b/resources/wx_gui/gui_macos_installer_flash.py
@@ -289,7 +289,7 @@ class macOSInstallerFlashFrame(wx.Frame):
             try:
                 total_bytes_written = float(utilities.monitor_disk_output(root_disk))
             except:
-                pass
+                total_bytes_written = initial_bytes_written
             bytes_written = total_bytes_written - initial_bytes_written
             wx.CallAfter(bytes_written_label.SetLabel, f"Bytes Written: {bytes_written:.2f} MB")
             wx.CallAfter(progress_bar.SetValue, int(bytes_written))