Software⏱️ 2 min read📅 2026-05-31

How to Fix error 487 Error – Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0

Git Extensions error Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0

Quick Answer: Try disabling Cygwin and see if the issue persists. If not, try reinstalling Git Extensions or updating to a newer version.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

The error 'Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0' is often caused by a misconfiguration of the Cygwin library or an issue with the Git Extensions installation.

🛑 Root Causes of the Error

  • Cygwin library corruption or misconfiguration.
  • Git Extensions installation issues.

🔧 Proven Troubleshooting Steps

Method 1: Cygwin Library Repair

  1. Step 1: Open the Command Prompt as an administrator and run the command `cygwin1.dll --repair` to fix any corrupted Cygwin library files.

Method 2: Git Extensions Reinstallation

  1. Step 1: Uninstall the existing Git Extensions using the Control Panel or by running `git extensions uninstall` in the Command Prompt.

💡 Conclusion

By following these steps, you should be able to resolve the 'Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0' issue and get your Git Extensions working again.

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