When I use yasnippet, I keep getting this error:

Warning (yasnippet): `foo-snippet' modified buffer in a backquote expression.
To hide this warning, add (yasnippet backquote-change) to `warning-suppress-types'.

I added this line to my config:

(setq warning-suppress-types (quote ((\(yasnippet\ backquote-change\))))) 

But it doesn't seem to have worked.

2 Answers 2


warning-suppress-types is a list defined in the warnings package. You first need to load this package with:

(require 'warnings)

and after this, add the warning using add-to-list:

(add-to-list 'warning-suppress-types '(yasnippet backquote-change))
  • 1
    I added that line but I'm getting an error: dixit.ca/stackexchange/backquote.html Jul 11, 2016 at 19:42
  • 1
    This is the error I get: Debugger entered--Lisp error: (void-variable warning-suppress-types) (member (quote (yasnippet backquote-change)) Jul 12, 2016 at 4:20
  • What version of emacs are you on?
    – Gastove
    Jul 13, 2016 at 16:46
  • 2
    Apologies, I have no idea what's causing that for you -- that variable should be baked in to Emacs after 22.1, by my understanding. What do you get if you remove that erroring line, start Emacs, and do M-x describe-variable <ret> warning-suppress-types <ret>?
    – Gastove
    Jul 15, 2016 at 17:00
  • 1
    I think this should be wrapped in (eval-after-load 'warnings ...), or needs a (require 'warnings) first.
    – npostavs
    Jun 14, 2017 at 17:50

Alternate answer is to fix foo-snippet so that it no longer modifies the buffer in backquote expression. See https://emacs.stackexchange.com/a/24062/5296 for some examples.

Also note that there was a bug causing yasnippet to issue this warning even when other buffers were being modified, so make sure you have the latest yasnippet (or else the current stable release (0.10) which doesn't have this warning at all). See https://github.com/joaotavora/yasnippet/issues/716

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