ctrl+n doesn't work when a function prototype starting with extern

Hello, everyone!

I am writing C program with VIM. I found the ctrl+n completion function doesn't when a function prototype starting with "extern".

Here is the detail:

If  file "a.h" contains a function prototype like "int hello_vim()",  I include file "a.h" using "#include "a.h"  in file "b.c". And then I can type "hello" and "ctrl+n" to auto complete by VIM. 

But if file "a.h" contains the function prototype starting with  extern like "extern int hello_vim()",  in file "b.c" "ctrl+n" won't be work correctly.

Is that any solution to deal with this problem?

I am using the VIM  7.4 on Fedora 20.

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