Can someone please help me with Word Doc Margins?

I have to do MLA formatting for an essay that I'm writing. The MLA format includes having 1 inch margins on the left, right, top and bottom of the page. When I set it up to be 1 inch in page set-up, the bottom doesn't change to 1 inch, it stays at 1.5 inches when I measure it with a ruler. Can someone please help me figure out how I can fix this problem and make the bottom of the page 1 inch? Thanks!