Change a File type from text to Haml

I created a new file, but i accidently forgot to add the .haml extension at the end of the file name. I tried to refactor the file by adding the correct extension after the fact. The filename with the extension is showing the correctly, but for whatever reason this file is not updated.  The icon has not changed and the text within the file is still in plain text.  Is there anyway to update the file to show it as a haml file? 

I have tried deleting and recreating the file with now success. 

Any guidedness would be appreciated.