Dism Error 87 Extra Quality Jun 2026

For a tool designed to fix broken operating systems, DISM Error 87 is ironically frustrating. It is the digital equivalent of a mechanic refusing to fix your car because you didn’t say "please" in the exact right tone. But behind this vague "parameter is incorrect" message lies a specific set of culprits, ranging from simple typos to architectural incompatibilities.

Error: 87 – The option is unknown.

In the modern Windows era, many users have abandoned the classic Command Prompt (cmd.exe) for the more powerful PowerShell. While PowerShell can run most CMD commands, it has its own syntax rules. dism error 87

To prevent DISM Error 87 from occurring:

If you are getting Error 87 in PowerShell, try switching to the standard Command Prompt (run as Administrator) to rule out shell interference. For a tool designed to fix broken operating

This error frequently occurs when there is a mismatch between the DISM tool you are running and the Windows image you are trying to service. For example, if you are running a 32-bit version of DISM (perhaps from a WinPE environment or a recovery drive) against a 64-bit Windows installation, the tool will be unable to parse the request correctly.

If you are attempting to run modern DISM commands on an older system—specifically Windows 7 or Windows Server 2008 R2—Error 87 is almost guaranteed. Error: 87 – The option is unknown

The classic "restorehealth" command is notorious for this. The correct syntax is: DISM /Online /Cleanup-Image /RestoreHealth

DISM /online /cleanup-image /restorehealth

Here is the breakdown of why this error haunts your command prompt and how to silence it.