Populating user form combobox with range question

[VBA FTW]

Hey there,
I'm working on a userform that has a few comboboxes that need to pull their data from a list on a worksheet. I'm using the following code:

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This code works if sheet "1213" is selected, but if it isn't selected, the comboboxes don't populate. I can activate sheet "1213" at the beginning of the code, but is there any other way to get around this? I'd rather not have to select that sheet via VBA if possible. Anyone have any pointers?

[VBA FTW]

I'm sorry, this was a stupid question, I just needed to add Sheets("1213") before Cells(i,13)