Stack Clearing (win32)

I am debugging my server app, and I'm having problems with the stack
when calling htons.

When I enter htons,

esp = 0012FF84

but after the call is complete,

esp = 0012FF86

The code is:

push strict word 100
call [htons]

Here is the sit information for htons:

http://msdn2.microsoft.com/en-us/library/ms738557.aspx

htons() takes a unsigned short, which is a word, right?

I can:

add esp, 2

to bring the stack down enough for setting up sockaddr, but I'm not
sure why I am ending up at 0012FF86 when my other window functions
return me back to 0012FF84.

Thanks,

Brian