I personally opted for the .htaccess approach (thanks to the comment by Joe Fletcher) to avoid altering site files and believe it’s slightly more elegant as it can easily be removed when the issue is fixed. For this to work, you must have the Apache Headers module enabled.
Add this to the end of your .htaccess file:
BrowserMatch MSIE best-standards-support
Header set X-UA-Compatible IE=8 env=best-standards-support