Fonts on Internet Explorer

Hi, I’ve uploaded a custom font and have it working splendidly on Chrome. However, IE won’t load it (Microsoft Edge loads it fine). This is my code:

@font-face {
	font-family: Heather;  
	src: url(-urlhidden-/wp-content/themes/enfold-child/DJB%20HeatherG.ttf);  
	font-weight: normal;  
}

I’ve hidden the URL because I didn’t want to post the code snippet as private content – an answer here may help someone else in future.

What would I need to add to this code to ensure it works on IE? I only have a .ttf file.

As a separate matter, thanks for your swift update after WordPress 4.5 broke a few elements on a couple of my sites. 3.5.3 is now working magically on all of my sites without issue.

Thanks :)