Ignore directory if matching filename exists - .htaccess

Question

I am currently using:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^(.+)/$ $1.html [L]
..To make pretty URLs for my .html files.
Assuming a directory structure like this:
/services/service-one.html
/services/service-two.html
/services.html
/something-else.html
service-one.html, service-two.html & something-else.html all work properly, but I can't get services.html to load using the /services URL because there is a directory matching the name.
Is there a way that this behaviour can be changed so that RewriteCond %{REQUEST_FILENAME}.html -f works regardless of the URL matching a directory? Or maybe another way of achieving the same result?
Thanks!
Edit
After removing my .htaccess and finding those non-.html links still work, I had a look in my VirtualHost and wonder if it is something in there causing it? I can see that MultiViews is what's giving me the URL rewrite behaviour that I wanted to achieve in the .htaccess
<VirtualHost *:80>
DocumentRoot "/mysite"
ServerName testsite.com
<Directory "/mysite">
Options Indexes FollowSymLinks MultiViews
AllowOverride All
Require all granted
</Directory>
# Other directives here
</VirtualHost>
Edit 2
Behaviour remains the same with no MultiViews, and using Anonymous's .htaccess

Answer 1

You have two options:
The reason this rule is not working is that you require a trailing slash to add the .html extension. You can just remove that requirement in the rewrite regex:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^(.+)$ $1.html [L]
The better way to do this is to create a file named index.html in the services directory. Then, when you request the directory without a filename, that file is automatically used.
For the first option to work, you would also need to change the default behavior. You can use this line to prevent adding a trailing slash to directories:
DirectorySlash Off