[AUCTeX] Reftex-toc prevent vsplit on goto

[Casper Thule]

I am currently using spacemacs with auctex. 

When I use reftex-toc and goto an item then it performs a vsplit and shows the content window on the right hand side. 

How do I prevent this splitting behaviour? I would like it to open in the current window from which the reftex-toc command was issued.

I added this hook to maximize the newly opened window: 

(add-hook 'reftex-toc-mode-hook 'spacemacs/toggle-maximize-buffer) but it is a suboptimal solution, as it influences other splits I might have made.