Android ADT 21.0 warning: Implicitly using the default locale

I've updated ADT to v. 21 and new warning appeared in this code:

if (e.getMessage().toLowerCase().contains("blabla"))

Implicitly using the default locale is a common source of bugs: Use toLowerCase(Locale) instead

So I try:

if (e.getMessage().toLowerCase(Locale.ENGLISH).contains("blabla"))

But error still remained! How fix this?