That's what I was afraid of as well, backup plan was a cross of steel wire on the back. But it was actually already fine free standing and fixing the upper shelve to the wall made it rock solid (Rock solid for as far bookshelves go, at least.).
Anchor it against the wall?
@coventry_eagle started
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That's what I was afraid of as well, backup plan was a cross of steel wire on the back. But it was actually already fine free standing and fixing the upper shelve to the wall made it rock solid (Rock solid for as far bookshelves go, at least.).