Dism Error 87 Fixed May 2026

Typically displayed in the Command Prompt as Error: 87 – The option is unknown , this error halts your repair efforts immediately. While the message sounds vague, it is actually a very specific syntax error. The good news? It is almost always fixable within minutes.

DISM /Online /Cleanup-Image /RestoreHealth

DISM /Online: /? DISM /Image: /? DISM /Cleanup-Image /? If a particular switch doesn’t appear in the help list, it doesn’t exist in your version of Windows (e.g., some switches are only for Windows PE). If your path contains spaces or unusual characters, wrap the path in double quotes and escape spaces properly. dism error 87 fixed

DISM \Online \Cleanup-Image Right: DISM /Online: /Cleanup-Image

If you are copying commands from a website, paste them into Notepad first and look for auto‑formatted slashes. If you are unsure about a specific DISM switch, let DISM teach you the correct format. Typically displayed in the Command Prompt as Error:

By carefully reviewing your command, ensuring /Online: has the colon, and running the tool with administrative privileges, you will resolve this error in under two minutes. For the rare cases where the error persists, repairing your system files with SFC or switching to PowerShell will get the job done.

In this comprehensive guide, we will explain what DISM Error 87 means, why it happens, and provide to fix it permanently. What is DISM Error 87? DISM (Deployment Imaging and Service Management) is a built-in command-line tool in Windows 10 and Windows 11. It is used to repair the Windows system image, including the recovery environment and Windows PE. It is almost always fixable within minutes

DISM /Online /Cleanup-Image /RestoreHealth Result: Error: 87 – The option is unknown.