Letter spacing in canvas element

Question

The question says it all pretty much. I've been searching around and starting to worry that it's impossible.

I've got this canvas element that I'm drawing text to. I want to set the letter spacing similar to the CSS letter-spacing attribute. By that I mean increasing the amount of pixels between letters when a string is drawn.

My code for drawing the text is like so, ctx is the canvas context variable.

ctx.font = "3em sheepsans";
ctx.textBaseline = "middle";
ctx.textAlign = "center";
ctx.fillStyle = "rgb(255, 255, 255)";
ctx.fillText("Blah blah text", 1024 / 2, 768 / 2);

I've tried adding ctx.letterSpacing = "2px"; before the drawing but with no avail. Is there a way to do this just with a simple setting, or will I have to make a function to individually draw each character with the spacing in mind?