Due to the conditional JavaScript commenting feature inside all versions of IE, It's possible for the sourceMappingURL comment at the end of the file to be executed as JavaScript if @cc_on has been used in any file anywhere before that line. See this bug report for more info: http://bugs.jquery.com/ticket/13274

The solution is to wrap the single-line comment in a multi-line comment.

/*
//@ sourceMappingURL=file.min.js
*/