Will my parcel arrive from the US as I forgot to put my Krakow postal number on the address?

Hello

So I have been waiting for a package from the states and its tacking too long more than 3 weeks pass, today i realized that the address i gave i wrote my name street name building number and apartment number with city name Krakow - Poland but i forgot to write my postal number, is that why my package still didn't arrive? and is it a problem that it didn't had the postal number? what will happen now what should i do?

Thank you so much
S

That's not a problem. Only difference is that package will be handled by a person instead of a computer.