Nunu's passive ability icon

it's gonna be a short post but the new ability icon on Nunu's passive is a bit unclear. It's hard to tell a difference between one stack in Nunu's passive and the passive full stacked. The passive stacks are being shown on top of the ability bar. When it isn't stacked fully it has this blue gray look to it. When it is full stacked it brightens up a bit becoming a bit more blue

The problem is that when you only have one stack in the passive it doesn't show a number just like when it's fully stacked. The colour difference is a bit too vague. It's hard to tell the difference. Can someone please add a number (1) to the first stack?