Yourls Errors in WordPress

I have wordpress working well in mysite.com but YOURLS which is installed in mysite.com/u is not working, when I click on any shortened link I get a 404 error (wordpress).

However, I get YOURLS to work by adding this to nginx.conf

location /u { try_files $uri $uri/ /u/yourls-loader.php;

But then WordPress links break.

Here is my default nginx.conf I know the fix is to add this try_files $uri $uri/ /u/yourls-loader.php; somewhere in nginx.conf , but where to put it without breaking wordpress.?

=================== Update 1 =========================

I got this partially working. with same config, but I noticed that wordpress links that start with u doesn't work ex: http://example.com/understand-math instead it redirect to Error 403 - Forbidden

???

================ update 2 ============

ok I fixed it by just adding another slash / to location /u/ instead of location /u

YOURLs NGINX CONFIGURATION

server {

  # Listen IPv4 & v6
  listen 80;
  listen [::]:80;

  # Optional SSL stuff
  listen              443              ssl;
  listen              [::]:443         ssl;
  ssl_certificate     example.com.crt;
  ssl_certificate_key example.com.key;

  # Server names
  server_name example.com www.example.com;

  # Root directory (NEEDS CONFIGURATION)
  root /path/to/files;

  # Rewrites
  location / {

    # Try files, then folders, then yourls-loader.php
    # --- The most important line ---
    try_files $uri $uri/ /yourls-loader.php;

    # PHP engine
    location ~ \.php$ {
      try_files      $uri =404;
      fastcgi_pass   unix:/var/run/php5-fpm.sock; # Can be different
      fastcgi_index  index.php;
      fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
      include        fastcgi_params;
    }
  }
}

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