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Table of Contents
Check Your Command Syntax
Use the Correct Options Together
Run Command Prompt as Administrator
Home System Tutorial Windows Series How to fix DISM error 87 in Windows?

How to fix DISM error 87 in Windows?

Jul 14, 2025 am 01:38 AM
windows DISM Error

Methods to resolve DISM error 87 include: 1. Check the command syntax to ensure the correct parameters and forward slashes are used; 2. Verify that the option combination is compatible and correctly references the external source path; 3. Run the command prompt as an administrator. This error is usually caused by a command input error or insufficient permissions. You can fix these problems.

How to fix DISM error 87 in Windows?

If you're hitting a DISM error 87 while trying to repair your Windows image, you're not alone. This error usually shows up when there's something off with the command you're running — most often a typo or incorrect syntax. The good news is that it's not a system-breaking issue, but rather one that can be resolved by double-checking how you're using the tool.

How to fix DISM error 87 in Windows?

Check Your Command Syntax

DISM (Deployment Imaging Service and Management Tool) is pretty strict about how commands are written. Error 87 pops up when Windows doesn't recognize what you're asking it to do — which usually means there's a mistake in how you typed the command.

  • Make sure you're using the correct syntax. A typical DISM scanhealth command looks like this:
    DISM /Online /Cleanup-Image /ScanHealth
  • Slashes matter — use forward slashes ( / ), not backslashes ( \ )
  • Double-check for typos — especially common mistakes like /CLeanup-Image instead of /Cleanup-Image

A small typo can throw everything off. Even an extra space or missing dash can trigger this error.

How to fix DISM error 87 in Windows?

Use the Correct Options Together

Sometimes the problem isn't with individual switches, but how they're combined. Not every DISM option works with every other. For example, if you're trying to restore health, you need to make sure you're pointing to a valid Windows image source — otherwise things might go sideways.

Here's a basic flow that works well:

How to fix DISM error 87 in Windows?
  • Start with /ScanHealth to check for issues
  • If problems are found, run /CheckHealth to get more details
  • Then proceed with /RestoreHealth if needed

Also, if you're using external sources like a mounted WIM file, make sure you include them properly:

 DISM /Online /Cleanup-Image /RestoreHealth /Source:C:\test\mount\windows

Make sure the path exists and the file is accessible.

Run Command Prompt as Administrator

Even if your syntax is spot-on, you might still get error 87 if you're not running the tool with enough permissions. DISM needs elevated rights to access system files and perform repairs.

To avoid permission-related issues:

  • Open Start and search for “Command Prompt”
  • Right-click it and select Run as administrator
  • Try your command again

This step may seem obvious, but it's easy to skip — especially if you're in a hurry.


That's basically all there is to it. Most DISM error 87 cases come down to simple human errors — mistyped commands, wrong flags, or missing admin rights. Fix those, and you'll likely clear the error without needing deeper troubleshooting.

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