# Troubleshooting Image Build¶

## More space needed¶

Images are built in tmpfs by default, to speed up the builds. In case your machine doesn’t have enough free RAM, the image building step can fail with a message like “At least 174MB more space needed on the / filesystem”. If freeing up more RAM isn’t a possibility, images can be built on disk by exporting an environment variable:

export DIB_NO_TMPFS=1