I forgot to add my 401K contributions on my taxes.?

Ok, so boxes 1 (wages and tips), 3 (social security), and 5 (medicare wages) all usually have the same monetary amount on W2s. On one of my W2s, the wages box was slightly less than the other two boxes, because I had a 401K of $157.99 - which I forgot to put in when I filed last night. Are they going to delay my taxes because of it? Thanks in advance. (Oh and no, I never got a loan from my 401K)