Sometimes, a corrupted system file inhibits DISM from working. Run System File Checker (SFC) to fix underlying issues. Open Command Prompt as Administrator. Type: sfc /scannow Press .
The most frequent reason for Error 87 is a formatting mistake. Windows Command Prompt is extremely strict about spacing. The Right Way: Ensure there is a . Correct: DISM /Online /Cleanup-Image /RestoreHealth
Before we fix it, let’s understand it.
He typed slowly, carefully, constructing the syntax in his mind. He needed to specify the source image. /Image:D:\Windows (Target the offline Windows directory). Wait, that was for the old tool. For DISM restore health, he needed to point to the source file to pull the good files from. dism error 87 fixed
Running in an elevated command prompt provides DISM with the system-level access it requires to execute repairs.
✅ There is no space after slashes ( / ), and RestoreHealth is one word.
Older versions of Windows (e.g., Windows 7, Windows 8) do not support the same parameters as Windows 10 or 11. A command that works perfectly on Windows 11 might throw Error 87 on Windows 7. Sometimes, a corrupted system file inhibits DISM from
The most frequent culprit is a simple typo. DISM parameters are case-insensitive, but they are spelling-sensitive .
Sometimes Error 87 appears because you are using a parameter that your specific DISM build simply does not have.
: If this service is disabled, DISM may fail. Open Services (type services.msc in Run). Type: sfc /scannow Press
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DISM /Online /Cleanup-Image /RestoreHealth /Source:WIM:E:\sources\install.wim:1 /LimitAccess Note: Change E: to match your mounted drive letter. Summary of Correct DISM Commands Exact Command String Scan Health DISM /Online /Cleanup-Image /ScanHealth Check Health DISM /Online /Cleanup-Image /CheckHealth Restore Health DISM /Online /Cleanup-Image /RestoreHealth
Ultimate Guide: How to Fix DISM Error 87 in Windows 10 and 11
After SFC completes, and then try your DISM command again.
He typed the command with sweaty fingers: DISM /Online /Cleanup-Image /RestoreHealth