Dism Error 87 Fixed May 2026

Conclusion

DISM Error 87 can be frustrating, but it can be resolved by following the methods outlined in this article. By running DISM with administrative privileges, checking and fixing corrupted system files, checking for conflicting software or services, updating Windows and DISM, and running SFC and DISM in Safe Mode, you should be able to fix the error and continue using the DISM tool without issues. If the error persists, you may need to seek further assistance from Microsoft support or a professional technician.

DISM Error 87 Fixed: A Step-by-Step Guide to Resolving the Issue

The Deployment Image Servicing and Management (DISM) tool is a crucial component of Windows operating systems, allowing users to service and manage Windows images. However, some users have been encountering the frustrating DISM error 87, which prevents them from using the tool effectively. In this blog post, we will explore the causes of DISM error 87 and provide a step-by-step guide on how to fix it.

What is DISM Error 87?

DISM error 87 is a common issue that occurs when users attempt to use the DISM tool to service or manage Windows images. The error message typically reads: "The DISM service failed. The base directory cannot be specified on the command line for online operations." This error can occur due to various reasons, including:

Causes of DISM Error 87

To resolve DISM error 87, it's essential to understand its underlying causes. Some of the common causes include:

How to Fix DISM Error 87

Fortunately, fixing DISM error 87 is relatively straightforward. Here are some step-by-step solutions to resolve the issue:

DISM (Deployment Imaging Servicing and Management) is a powerful Windows tool for repairing system images. Error 87 usually appears when you mistype a command, use incorrect syntax, or run an unsupported option in your current Windows environment.

In rare cases, the error appears even with correct syntax. This usually means the DISM component itself is damaged. Try these steps:

If you are a Windows user who has ever tried to repair a corrupted system image using the Deployment Imaging and Service Management (DISM) tool, you may have encountered a frustrating roadblock: DISM Error 87. dism error 87 fixed

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.

In this comprehensive guide, we will explain what DISM Error 87 means, why it happens, and provide seven proven methods to fix it permanently.

The most common trigger is a simple typing mistake. Compare your command to the correct syntax below.

Correct command to check and repair system files:

DISM /Online /Cleanup-Image /RestoreHealth

Or using the newer syntax (Windows 10/11):

DISM /Online /Cleanup-Image /RestoreHealth /Source:repairSource\install.wim /LimitAccess

Important formatting notes:

Example of a typo that causes error 87:

DISM /Online /Cleanup-Image /RestoreHealths  ❌ (extra "s" on RestoreHealth)

If you have tried all seven methods and the error persists, consider these edge cases:

Rarely, the DISM module itself is damaged. Run:

dism /online /cleanup-image /revertpendingactions

Then reboot and retry the original command.

If you are using the /RestoreHealth command and pointing to a specific Windows installation media (like a mounted ISO or USB drive) to fix a corrupted system, Error 87 can occur if the path to the "install.wim" file is incorrect or formatted improperly.

The Fix: Ensure you are pointing to the correct file inside your installation media, usually located in the sources folder. Conclusion DISM Error 87 can be frustrating, but

Correct Syntax: DISM /Online /Cleanup-Image /RestoreHealth /Source:wim:D:\sources\install.wim:1 /limitaccess

Tip: To find the correct index number, run the following command to list the available versions inside your WIM file: DISM /Get-WimInfo /WimFile:D:\sources\install.wim