EPUB export: Is there a way to remove UUID once ISBN is configured?

I'm doing EPUB export from InDesign CS6 8.0.1 on OS X 10.7.5.

Validation with epubcheck is throwing this error:

WARNING: /Users/dinah/Desktop/Art of the Shim.epub/OEBPS/toc.ncx: meta@dtb:uid content '978-0-9839980-3-7' should conform to unique-identifier in content.opf: 'urn:uuid:37AA3F7D-1626-451E-847F-8F3F939EC105'

I could only find one place (EPUB export dialog) to assign the ISBN as unique identifier, but InDesign is clearly hanging onto the UUID it generated:

content.opf contains

toc.ncx correctly just has

Could anyone point me in the right direction for fixing this within InDesign? I'd love to get a valid EPUB output before I do any tinkering in the EPUB files outside of InDesign.

Thanks,

Dinah