snippets for .wiki?

Hi, I have just started to use UltiSnips and I like it. I have installed it on gVim on Windows.

I also use the vimwiki plugin, that creates files with the extension .wiki. When I used UltiSnipsEdit, the file was created with my personal wiki snippets. If I use <c-Tab>, I can see my snippets listed along with box, bbox and lorem. But when I type any of these and hit <Tab>, the snippet is not inserted.

I have tried other filetypes and there are no issues there, so I think that it is related to the .wiki filetype.

Any ideas?