In recent years many researchers have called for an English as an International Language (EIL) perspective to be considered in contemporary English Language Teaching (ELT) (cf. e.g., Galloway & Rose, 2015). However, adding a new lesson or component on EIL to an existing program is not enough. What is needed is a complete revision of the entire program, using one’s understanding of the use of English in international contexts as a foundation that underpins every single aspect of the curriculum. It entails a major overhaul, but a much-needed one (Matsuda & Friedrich, 2012, p. 25). Implementing profound changes to the curriculum is a first step towards including an EIL perspective, but in this chapter, we argue that a significant change in thought patterns concerning Standard Language Ideology (SLI) among teachers needs to take place as well in order to bring about a successful shift in perspective. We discuss a number of sociolinguistic topics which are relevant in this context that might have been overlooked so far and provide a number of practical suggestions for university courses which focus on English linguistics in the classroom.