How to Fix DISM Error 87 in Windows 11, 10 and 7

  

Written By Amit Patra

Approved By Anuraag Singh  

Modified On March 2nd, 2026

Reading Time 8 Minutes Reading

Well if you are facing the same DISM Error 87 you are probably trying to repair your Windows system corruption but let me tell you instead of fixing your PC the Windows is rejecting your command and this issue appears in:-

• Windows 11
• Windows 10
• Windows 7
• While running cleanup-image
• While using restorehealth
• During update repair

But as always the good news for you is that in this case and the error is not very serious system damage. It is usually caused by incorrect syntax, version mismatch and because of the permission issues. So in order to solve these issues today I will explain you the complete error cases:-

• What DISM Error 87 really means
• Why it happens in Windows 11, 10, and 7
• How to fix it properly
• Why most online guides miss key causes
• When it may indicate deeper disk problems

So let’s start learning and first of all let’s know what DISM actually is and why we use it.

What Is DISM and Why Do You Use It?

DISM simply stand for (Deployment Image Servicing and Management) and this is a built-in Windows repair utility that is used to fix the following:-

• Fix corrupted system files
• Repair Windows component store
• Resolve Windows Update failures
• And restore damaged Windows images

And let me tell you that here you can see the most common repair commands that users run below.

DISM /Online /Cleanup-Image /RestoreHealth

And if Windows responds with Error: 87 – The parameter is incorrect. Well that’s officially known as DISM Error 87.

What Does DISM Error 87 Mean?

So if we figure out this technically DISM Error 87 this simply means: The command-line parameter entered is invalid or it is not recognized by DISM. In simple words this means Windows does not understand the command you have typed.

And also this does NOT automatically mean:-

• Windows is broken
• Your PC is beyond repair
• Your data is lost

However most of the time it is just a command formatting issue nothing more than that.

Quick Suggestions: You can also read Windows Failed to Start Error 0xc000000f and check how quickly you can troubleshoot this error.

Why Does DISM Error 87 Happen?

This error usually occurs when Windows cannot understand the command entered. This happens due to incorrect syntax, unsupported parameters, permission issues or version compatibility problems in Windows 11, 10 and also in Windows 7.

1. Incorrect Command Syntax

This is the most common and the biggest reason behind error 87 when running dism is typing mistakes as Windows Command Prompt is highly strict and even a minor spacing or punctuation mistake triggers the error. You can check below all examples of wrong commands and at last the way to write correct commands.

Check these common incorrect command examples:-

So as it is very clear with above example even your one missing space can triggers:-

• Error 87 DISM doesn’t recognize the command-line option
• DISM error 87 cleanup-image option is unknown

So yes Windows command-line is extremely strict and while using it we should check all the parameters carefully so it will be very helpful in diagnosing the problems at the root level.

2. Not Running Command Prompt as Administrator

If you run DISM without elevated permissions then Windows may not execute advanced parameters and this often causes:-

• DISM error 87 windows 11
• DISM error 87 windows 10

And to fix this you need to simply:-

1. Search CMD
2. Just Right click Command Prompt
3. And select Run as administrator option

Then you can try this again.

3. Windows 7 Compatibility Issue

There are many users who are searching:-

• DISM error 87 windows 7
• DISM online /cleanup-image /restorehealth error 87 windows 7

Important 2026 clarification:

The /RestoreHealth parameter is not fully supported in original Windows 7 builds and that’s why Windows 7 users often see:-

DISM error 87 restorehealth option is not recognized in this context

And if you are using Windows 7 you can use:-

sfc /scannow

instead of RestoreHealth.

4. Typo in Cleanup-Image Parameter

Well there is another frequent cause:-

Typing:

/cleanupimage

instead of:

/cleanup-image

So this triggers the DISM error 87 cleanup-image option is unknown to Windows 11 as the dash (-) is mandatory.

5. Using Outdated Repair Instructions

Some of the old tutorials recommend commands that:-

• Don’t apply to Windows 11 23H2+
• Use deprecated parameters
• Mix PowerShell and CMD incorrectly

And modern Windows builds require proper command formatting as outdated instructions often lead to this Error.

How to Fix DISM Error 87 – Advanced Troubleshooting Tips

If the simple fix does not work for you and the error is still persists well at this stage you can follow this structured approach to fix this error.

Step 1: Verify DISM Version

Run:

DISM.exe /?

Check if /Cleanup-Image is listed. And if it is not listed it means your Windows version may be outdated. You need to install the latest cumulative updates.

Step 2: Check Windows Version

You need to run the following code:-

winver

Step 3: Check Disk Health

If DISM continues to fail then the problem may not be syntax so here you can

Run:-

chkdsk C: /f

If the disk errors appear then it is absolutely sure your drive may have:-

• File system corruption
• Bad sectors
• Physical damage

In such cases it is recommended to secure your files using Professional Data Recovery Software before you plan to perform deeper system repairs as once you lost your data it is difficult for you to recover it and if it is overwritten it will become almost impossible to get it back.

And if your hardware damage is suspected well in such a case a specialized Corrupted Hard Drive Recovery solution may be necessary.

When DISM Error 87 Is a Symptom of Bigger Issues?

Well in very rare cases and this error may indicate the following:-

• Severely corrupted Windows image store
• Damaged WinSxS folder
• Malware modifying system commands
• Environment variable corruption

If both SFC and DISM are fail repeatedly in this case you may need:-

• In-place upgrade repair
• Windows Reset (Keep files option)

But the most important thing is to always backup your data first.

Windows Version Comparison

What Happens If You Ignore DISM Error 87?

Ignoring this error means that your system corruption may remain unrepaired and Windows updates may continue to fail. Also performance may gradually decrease and unresolved system file issues may eventually lead to crashes.

• System corruption remains unfixed
• Windows Update may fail
• Performance issues may continue
• Future crashes may occur

So while the error itself is not dangerous but yes unresolved corruption can cause long term instability for your system.

Frequently Asked Questions

Q1.Why does DISM say the parameter is incorrect?

Well this is because of the command format is wrong or it is not supported in your Windows version.

Q2. Is DISM Error 87 dangerous?

No it is not dangerous but let me tell you this is usually a syntax or compatibility issue.

Q3. Why do I get DISM error 87 cleanup-image option is unknown?

This DISM /online /cleanup-image /restorehealth error 87 the cleanup-image option is unknown because you likely mistyped /Cleanup-Image or you have used the outdated instructions.

Q4. Can DISM Error 87 indicate hard drive failure?

Very rarely and only when disk errors appear alongside a smart failure predicted on hard disk warning.

Final Verdict

DISM Error 87 is one of the most common Windows repair command errors but fortunately it is usually easy to fix if you follow the correct approach as suggested in this article and yes in most of the cases the solution is:-

• Correct command formatting
• Run as Administrator
• Verify Windows version compatibility
• Run SFC first
• And last check disk health if it is necessary