diff --git a/NEWS.txt b/NEWS.txt
index 2a6fadb..68ba514 100644
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -39,20 +39,29 @@ Bug fixes
 
 - Fix problem with null values and pie plugin (patch by gcruxifix,
   issue 500).
+
 - Fix problem with threshold plugin and bars (based on patch by
   kaarlenkaski, issue 348).
+
 - Fix axis box calculations so the boxes include the outermost part of
   the labels too.
+
 - Fix problem with event clicking and hovering in IE 8 by updating
   Excanvas and removing previous work-around (test case by Ara
   Anjargolian).
+
 - Fix issues with blurry 1px border when some measures aren't integer
   (reported by Ara Anjargolian).
+
 - Fix bug with formats in the data processor (reported by Peter Hull,
   issue 534).
+
 - Prevent i from being declared global in extractRange (reported by
   Alexander Obukhov, issue 627).
 
+- Prevent pie slice outlines from being drawn when the stroke width is
+  zero (reported by Chris Minett, issue 585)
+
 
 Flot 0.7
 --------
diff --git a/jquery.flot.pie.js b/jquery.flot.pie.js
index 14a37ad..ef864a3 100644
--- a/jquery.flot.pie.js
+++ b/jquery.flot.pie.js
@@ -347,20 +347,20 @@ More detail and specific examples can be found in the included HTML file.
 			
 			function drawPie()
 			{
-				startAngle = Math.PI*options.series.pie.startAngle;
-				
+				var startAngle = Math.PI * options.series.pie.startAngle;
+				var radius;
+
 				// set radius
-				if (options.series.pie.radius>1)
-					var radius = options.series.pie.radius;
-				else
-					var radius = maxRadius * options.series.pie.radius;
-				
+				if (options.series.pie.radius > 1)
+					radius = options.series.pie.radius;
+				else radius = maxRadius * options.series.pie.radius;
+
 				// center and rotate to starting position
 				ctx.save();
 				ctx.translate(centerLeft,centerTop);
 				ctx.scale(1, options.series.pie.tilt);
 				//ctx.rotate(startAngle); // start at top; -- This doesn't work properly in Opera
-				
+
 				// draw slices
 				ctx.save();
 				var currentAngle = startAngle;
@@ -370,25 +370,28 @@ More detail and specific examples can be found in the included HTML file.
 					drawSlice(slices[i].angle, slices[i].color, true);
 				}
 				ctx.restore();
-				
+
 				// draw slice outlines
-				ctx.save();
-				ctx.lineWidth = options.series.pie.stroke.width;
-				currentAngle = startAngle;
-				for (var i = 0; i < slices.length; ++i)
-					drawSlice(slices[i].angle, options.series.pie.stroke.color, false);
-				ctx.restore();
-					
+
+				if (options.series.pie.stroke.width > 0) {
+					ctx.save();
+					ctx.lineWidth = options.series.pie.stroke.width;
+					currentAngle = startAngle;
+					for (var i = 0; i < slices.length; ++i)
+						drawSlice(slices[i].angle, options.series.pie.stroke.color, false);
+					ctx.restore();
+				}
+
 				// draw donut hole
 				drawDonutHole(ctx);
-				
+
 				// draw labels
 				if (options.series.pie.label.show)
 					drawLabels();
-				
+
 				// restore to original state
 				ctx.restore();
-				
+
 				function drawSlice(angle, color, fill)
 				{	
 					if (angle <= 0 || isNaN(angle))