Hide command button, based on cell value when linked to another sheet?

Please could someone help me with below code, essentially it hides two command buttons if a value in a cell is over 183.

It works when I type a number into the cell (K4), but its going to be linked to another cell on another sheet, so it contains the formula ='3'!$L$3.

Doesn't work when it's sent up this way? Code below.

Private Sub Worksheet_Change(ByVal Target As Range)
    If Range("K4").Value <= 183 Then
    CommandButton21.Visible = True
    Else
    CommandButton21.Visible = False
    End If
    If Range("K4").Value <= 183 Then
    CommandButton22.Visible = True
    Else
    CommandButton22.Visible = False
    End If
End Sub

Thanks